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Early Television Museum

Changes and Additions to the Site

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Apr 17
Can anyone answer Robert's question about TV cabinet polish?
 
Apr 15
The 2014 Convention (May 16-18) is only a month away. Register Now.
We now have 95 Museum members. Become a member now - support the museum
 
Apr 10
Peter Yanczer's obituary
 
Apr 9
Color Television Here
 
Apr 7
Prewar Database updated: Meissner 10-1153 kit in cabinet added
Mechanical Database updated: Hollis Baird model 26/36 added
 
Apr 6
Article about RCA 1938 monoscope
 
Apr 5
Monochrome NOS CRTs for sale at the museum
RCA 1945 projection system
Western Television advertising literature
 
Apr 4
Tiny Triniscope - made by Richard Diehl
 
Apr 3
Auction Items for the 2014 Convention are now being displayed online. If you have something for the auction, enter it here.
 
Apr 2
Western Visionette in non-factory cabinet in auction
Mechanical Database updated: Western Visionette added
Coming soon: The museum has received over 250 NOS CRTs, including late 40s round black and white and early rectangular
color tubes. We are making them available to the collecting community at reasonable prices. 100% of the sale price goes
to the museum to support our operations.
 
Mar 29
A French Television System
Television Sheds Much of Mystery
Television's first beauty queen
 
Mar 25
Bulova watch commercial, 1941
 
Mar 23
Peter Yanczer, founder of the Experimental Television Society and mechanical television expert, dies at the age of 86
 
Mar 21
More 2014 Convention information. CRT Rebuilding Room work days Friday before and Monday after the convention. Details here.
TV Site Testing and Measurement Techniques
1950 - Banner Year for TV
What Ever Happened to Channel 1?
Three-Dimensional Television System
How to Select Your TV Antenna
 
Mar 20
Postwar Antennas: Wineguard TU-500, Rembrandt
DuMont 1939 advertisement
 
Mar 17
More prgress on the CRT Rebuiding room
 
Mar 15
Belmont 1939 receiver magazine article
General Electric 3D Color Camera
 
Mar 13
Where is Television?
Parts Market for Television is Found Good
Scanning
Mechanical TV training schools
Bloch Shows 3-Foot Images
W6XAO Reports No Fading, No Static
"Best Station Seen" - W2XAB
Single Sideband for Vision
Two Types of Television Receivers
1932 TV broadcast transmission times
A Television Projector
 
Mar 10
Andrea 1-F-5 operating manual
 
Mar 9
More prgress on the CRT Rebuiding room
RCA 16 and 21 inch tri-color CRTs
 
Mar 8
Baird T-5 in Museum Victoria (Australia)
 
Mar 6
1951 Kaye-Halbert
 
Mar 5
Belmont 1947 antenna
 
Mar 2
New acquisition: DuMont studio speaker
TV Man - The Search for the Last Independent Dealer, film by Steve Kosareff, Kickstarter campaign
WRGB postcard - 1945
Article in 405 Alive about use of the Alexandra Palace transmitter to degrade German airplane navigation
Article about our unidentified prewar British set
 
Feb 28
Prewar Database updated: Late 30s Baird mirror in lid set added
Baird intermediate film camera
 
Feb 27
1995 article from 405 Alive about the EMI Emitron camera
RadioMarelli advertisement
Seeing by Wireless at Last - Jenkins 1923 Article
Television - first British TV magazine (courtesy of Steve Dichter)
 
Feb 25
Did the British Post Office build a coaxial cable network to monitor German transmissions from Paris in 1942?
Pye MK3 camera
"Search Site" button added to top menu bar
 
Feb 23
DuMont Service Notes for RA-101 to RA-111 added to the TV Schematic Diagrams page
Rosing CRT - 1912
American Ideas for Transatlantic Television (1952)
Baird Crystal Palace transmissions
 
Feb 21
Autumn 1955 BBC NTSC Colour Tests
German WW2 TV broadcasts from Paris
German television guided bomb
Baird T-5
More on Caroline
Baird 1938-39 prototype
 
Feb 20
EMI Emitron camera pictures
Another CTC-4 assembly line picture
Caroline TV- A 1964 British airborne system
Express Advertising for TV, 1937 Style
BBC NTSC Colour TV Experiments
1989 article in 405 Alive describes DX TV before the war.
1936 405 Line Standards
Crosley color converter
 
Feb 19
Servicing Television Sets (1939)
Television IFs (1939)
Transmission Paths (1938)
Deflection Circuits (1939)
Garod 100 article
Color Television (Service article)
Lorenzen color system (1940)
Television Antennae
Dumont intensifier
Sylvania CRTs
National Union CRTs
Cunningham tube advertisement
Meissneer advertisement
Andrea advertisements
KH phototube
Neotron neon
Westinghouse H840CK15 service manual and the Westinghouse Color Television Service School, courtesy of Ingo Kubbe.
RCA CT-100 Service Clinic, courtesy of Ingo Kubbe.
 
Feb 18
1928 Television Magazine, Vol. 1 No. 1 and Vol. 1 No. 2 (very large files)
RCA TT-5 dealer display
General Electric 7 inch 1938 prototype
General Electric HT-8 and HT-10 prewar antennas
 
Feb 17
Register Now for the 2014 Convention, to be held May 16, 17 and 18
TV Repair Facility - San Antonio TX (?) ca 1950
 
Feb13
Philips 1940 mobile van
 
Feb 12
TV Comes to Alexandra Palace 1938 British Pathe film segment
 
Feb 11
RCA ITV-1 Vidicaon camera/monitor schematic
Articles on 1928 Baird color system
Prewar Database updated: Cossor 1210 added
 
Feb 9
PIctures of Brami Visiola
Long neon lamps
Mechanical Database updated: Brami Visiola added
 
Feb 7
Pictures of British and European mobile production vans
 
Feb 6
Major - British mechanical set
Article by Peter Smith in the Narrow Bandwidth Television Association Newsletter about synchronizing the 1931 Telehor 30 line scanner
 
Feb 4
Web site being changed to new format. Please report any strange looking pages.
RCA and NBC Petition FCC to Adopt Standards
 
Feb 2
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
A Reqium for Downtown Burbank
 
Jan 30
Emerson 15 inch color prototypes
 
Jan 29
Billboard Articles - CBS Color Decision Oct. 21, 1950
RCA Markets Tube (courtesy of Steve Dichter).
Empire State Television Shows Marked Advance (1937)
 
Jan 28
Article by Jeff Lendaro about discovering the RCA 120 line prewar set (courtesy of Darryl Hock)
Was the DuMont Duoscopic originally designed for 3D?
 
Jan 27
Want to make a presentation at the 2014 Convention? Please contact us.
Here is Pete Deksnis's procedure for setting up the CT-100 color balance
 
Jan 26
Article by Ludwell Sibley about the Zworykin 1928 CRT receiver
Article by Jeff Lendaro about Television Attachments
Article by Jeff Lendaro about other sets at the1939 Worlds Fair
Prewar Database updated: RCA TRK-12 (reported but not verified) added

German Prewar and Mechanical databases updated with information from Gerolf Poetschke's website

 
Jan 25
Do you know the original prices for these sets? Please help.
 
Jan 16
Prewar Database updated: RCA TT-5 (reported but not verified) added
 
Jan 12
RCA 1946 prototype projection set
Prewar Database updated: Andrea 1-F-5 added
 
Jan 11
RCA TK-41 at Mock Battle - Fort Meade, 1954
 
Jan 9
New estimate of surviving CT-100s from Pete Deksnis - 159 sets.
 
Jan 7
CBS color studio - 1954
Joint NBC-CBS TV program, November 5 1936
Revised CT-100 serial number list from Pete Deksnis
 
Jan 5
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
Television Eye Will Make True Wildest Dreams
W2XCR first sight-sound broadcast
Coaxial cable used in 1937 Bell Labs TV "pipe"
American Appliance-TV Stores - Milwaukee
 
Jan 4
Cossor 1935 12 inch CRT
RCA Berkshire Breakfront Model
 
Jan 3
Prewar Database updated: Meissner 10-1153 kit in cabinet added
 
Jan 2
RCA Big Color Celebration Poster
John Folsom and Bob Galanter build a replica motor control chassis for a Gray Research monitor
 
Jan 1, 2014
Happy New Year!
Rare sets added to the database in 2013: Mechanical - 4, Prewar - 14, Color - 10
 
Dec 31
Last chance to make a tax deductible contribution to the museum for 2013
Prewar Database updated: HMV 900 added
 
Dec 30
Mechanical Database updated: Western Visionette added
Color Database updated: RCA Model 5 (cabinet only) added
 
Dec 29
Progress report: CRT rebuilding project
 
Dec 27
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Dec 24
FCC Approval of Color Standards Launches RCA and NBC "Introductory Year"
RCA 1957 Brochure (courtesy of Eric H)
 
Dec 23
Sony 19 inch Chromatron photos
RCA CTC-4 promotional photo
 
Dec 22
Alliance rotor brochure
JFD, Snyder antennas
 
Dec 15
RCA Color Exhibit at the Texas State Fair (1955)
 
Dec 11
Dentavision
To Transmit Talking Pictures by Television
Coming Out of Color
 
Dec 10
Vets Look Over Television Setup
Amateurs Shoot Color TV
 
Dec 7
NBC's first color remote van
CBS medical television network - 1951
 
Dec 1
Generous donations to the CRT Rebuilding Fund: Ralph Sargent $1,000, Steffen Demos $200.
 
Nov 27
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Nov 25
Postwar television advertising literature
 
Nov 24
Mechanical television advertising literature
Pre-1945 advertising literature
 
Nov 22
Transvision 7 and 12 inch kit factory Service Notes
Square Root Phase Control Antenna
Corning TV Bulb Selector
 
Nov 21
W9XZV Chicago in 1943
 
Nov 17
DuMont CRT specifications (1956) Courtesy of Cliff Benham and Jim Hawes
 
Nov 13
Color Database updated: RCA CTC-4 added
 
Nov 11
Color Database updated: RCA CTC-4 added
W9XAO drawing
Network Television Preview Theatre Ticket
W6XYZ in a video game
Diary of a Viewer - 1947 New Yorker article
1950s ABC studio
 
Nov 10
Sarnoff Collection display at the College of New Jersey (courtesy of Dave Sica)
First use of a helcopter for news coverage
NBC Fire (1939)
 
Nov 9
NBC and CBS Rush Video Equipment
Zenith press conference - field sequential receiver
Bace monitor
1951 Farnsworth assembly line
CBS broadcast of SKF medical programming
Skiatron 1951 color projection system
Picture Catalog of 1956 Color TV Sets
CBS prototype field sequential camera
Topping color converter (1969)
TV on London Stage
1942 U. S. TV station list
RCA Color TV advertisements
 
Nov 8
Prewar Database updated: The Benton County Historical Society has a GE HM-225 not a HM-226
 
Nov 4
Mechanical Database updated: Russian B-2 added
 
Nov 3
Mt. Wilson ca 1949
NBC relay from the Polo Grounds
WABD 1944 telecasts
W6XYZ 1944 telecasts
W6XAO 1944 telecasts
WBKB 1944 telecast
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
Television Receiver Specifications - 1950-51
 
Oct 25
The RCA Story - Article by Richard Brewster in the AWA Review
Delco car TV (?) prototype
 
Oct 19
Prewar Database updated: HMV 900 added
 
Oct 17
1939 Iconoscope camera in the NHK Museum
Mechanical camera in the NHK Museum
 
Oct 15
From Nothing Much to Something Good in Television
RCA 1800 CRT
Two New Kinescopes Encourage Experimentation
Daven 1928 Advertisement
I. C. A. 1928 advertisement
How to Build a Television Receiver
RCA Offers a Complete Line of Television Tubes
 
Oct 14
Experiment at 120 Miles
Television Pickup is Moved Outdoors
Television Coaxial Cable
Who Invented Color Television?
Columbia's Television Transmitter Gets First Power Tests
Farnsworth 1936 camera
Farnsworth 1936 prototype
Roscoe George and Television at Purdue University
July 4, 2004 article in the Sunday Post about John Logie Baird
 
Oct 13
RCA 31 inch CRT
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
Aiken flat CRT
Wickes color test equipment
 
Oct 12
CRT Rebuilding progress report
Baird T-27
Farnsworth 1940 Image Dissector
 
Oct 11
RCA Ham Tips, June-July 1940 1847 Amateur Iconoscope
 
Oct 10
Color Database updated: Westinghouse 840CK15 added
 
Oct 9
1949 WLW-D schedules and brochure
Transvision 7 inch kit assembly manual
 
Oct 7
The story of the Transvision kit with 5 inch CRT
 
Oct 6
New acquisition: Philco 48-700
Coin operated TV set in motel in the Washington DC area, ca 1950
Postcards from the early 50s from Indian students at Hollywood Radio and Television Institute
 
Oct 5
New acquisition: Transvision kit with 5 inch CRT
Gray Research monitor - photo of rear after new restoration work
1936 Berlin TV transmitter tower
 
Oct 4
Andrea 1-F-5 for sale
RCA 21 Inch Color TV in Production - RCA Radio Age article
 
Oct 1
Color Database updated: Raytheon 21C1M added
 
Sept 30
Live - From Coast to Coast! - Article by Richard Wirth
 
Sept 29
Another Baird Televisor display unit
 
Sept 28
Museum starts Membership Program. If you made a donation during 2013, you are a member until the end of the year.
1947 WPTZ program schedules
 
Sept 22
New acquisitions: Electro-Voice, Philco and RCA UHF converters, Turner TV Booster
 
Sept 19
Updated CT-100 serial number list from Pete Deksnis
 
Sept 17
A TRK-12/120 scam is presently on Craiglist in London
 
Sept 16
Recollections of Jerry Korb about DuMont
 
Sept 10
Rawls 1932 advertisement
 
Sept 7
Prototype RCA CTC-4 photo
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Sept 6
Prewar Database updated: RCA TT-5 added
 
Sept 5
Prewar Database updated: Marconi 707 added
 
Sept 4
Finally - progress on CRT Rebuilding at the museum
 
Sept 3
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
RCA Begins Production of Color TV Sets - RCA Radio Age article
 
Aug 29
Article about W8XCT Cincinnati
Crosley Network (1949)
Sports Events Increase in Ratio to Video Sets
Television Simple? Don't You Believe it! Here's the Dope
Extension of Cables Will Link Columbus With Video Network
 
Aug 28
Newspaper and Magazine Articles About the Museum
Amateur Television - A Progress Report
Converting the WW2 RCA CRV-59 iconoscope camera for use with NTSC
Admiral brings you Color TV Optional Brochure
Dage camera used by ABC in Eisenhower inaugural parade
CBS 12CC2 advertisement
What's Cooking in Color TV
National Prewar Sets
Build Your Own Television Receiver
Do Your Own Televising
 
Aug 26
Hudson-Essex car company television exhibit
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Aug 25
RCA Berkshire Regency advertisement
 
Aug 23
First televised Cincinnati Reds game - 1939
More on John Yurkon's project: making an all-glass 15GP22
 
Aug 22

RCA Dealer Sheets: TT-5, TRK-5, TRK-9, TRK-12 (Courtesy of Eric Coon)

 
Aug 20
More on John Yurkon's project: making an all-glass 15GP22
 
Aug 14
Tubes available for sale now at the museum
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Aug 13
First National Television 1935 brochure
RCA 1945 microwave network advertisement
Postcards of the RCA Exhibit at 1939 Worlds Fair
 
Aug 12
Television at the Mt. Whiteface Weather Station - 1940
Rauland theatre TV advertisement
 
Aug 11
Life Magazine photos of NTSC medical system at Walter Reed hospital
Modern Replicas of Early Color Sets
'Goldmark I' - Field Sequential Color TV Project - Richard Diehl
 
Aug 10
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Aug 9
The Early Television Foundation 2012 Form 990-PF
More on John Yurkon's project: making an all-glass 15GP22
 
Aug 6
More on John Yurkon's project: making an all-glass 15GP22
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
 
Aug 4
Television - Three Varieties (1939)
 
Aug 3
RCA TT5-A Transmitter technical manual
United Television Laboratories Lesson 98 - The Mononscope Camera Chain
 
Aug 1
Prewar Database updated: RCA TRK-5 added
 
July 31
Scam alert
It might seem like overkill to do all this testing, but I don’t want to have anything break after all of this work.
 
July 30
United Television Laboratories Lesson 99 - Television Station Equipment
 
July 29
More on Brian Cuff's amazing reconstruction of a GEC BT-8161
Chuck Pharis Camera and Microphone Museum
The Mother of Invention of Videotape: One More Time for the West Coast
United Television Laboratories Lesson 100 - Color Television
More on John Yurkon's project: making an all-glass 15GP22
 
July 25
More on John Yurkon's project: making an all-glass 15GP22
 
July 19
United Television Laboratories (Louisville)
 
July 18
2014 Convention to be held May 16, 17 and 18. Details to follow.
Recollections from Bob Davis about W3XWT, courtesy of the National Capital Radio and Television Museum
 
July 17
More on Brian Cuff's amazing reconstruction of a GEC BT-8161

New acquisition: Hospix hospital set

Mechanical sets and cameras made by Peter Yanczer
 
July 16
RCA promotional brochure on Dot Sequential Color, courtesy of John Tyminski.
Recollections about WTTG (W3XWT) by Gordon Williamson, an early employee
Gordon Williamson
 
July 10
World premiere for Steve Kosaref's documentary film TV Man - The Search for the Last Independent TV Dealer
Mechanical Database updated: Hollis Baird 25-35 receiver added
 
July 8
Transvision kit in Brooklyn
KTLA mobile van
 
July 7
More on Brian Cuff's amazing reconstruction of a GEC BT-8161

More on John Yurkon's project: making an all-glass 15GP22

 
July 5
Brian Cuff's amazing reconstruction of a GEC BT-8161
 
July 4
Baird Television, a site about Baird maintained by his son and grandson.
1971 TV guide article about Charles Jenkins (courtesy of John Pinckney)
 
June 29

More on John Yurkon's project: making an all-glass 15GP22

 
June 23
CBS Hytron 15HP22
Video about Baird Telechrome CRT
Dave May's restoration of our RCA CTC-5 completed
The Color Wheel and I
Trav-Ler mechanical set similar to the Western Empire State
 
June 18
Allied Radio, 1939-42 catalogs - television
Allied Radio 1929-33 catalogs - television
Television in postwar radio catalogs
Arkay Fantasia - inspired by the Kuba Komet
General Electric 1959 Remote
 
June 17

More on John Yurkon's project: making an all-glass 15GP22

 
June 13
1944 GE broadcast equipment brochure and price list (Courtesy of Bobby Ellerbee)

More on John Yurkon's project: making an all-glass 15GP22

 
June 11
More on John Yurkon's project: making an all-glass 15GP22
WEWS announcement for CBS color broadcasts
 
June 10
ATI television-telephone system newspaper articles (courtesy of Wayne Bretl)
 
June 8
John Yurkon's project: making an all-glass 15GP22
 
June 7
Updated list of parts available
 
June 6
Eidophor color wheels
Advertising and Sales Promotion - Catalog Supplement (Courtesy of Wayne Bretl)
Color TV is Here - Sales Promotion Kit (Courtesy of Wayne Bretl)
 
June 4
Comparison of British and American pre-1945 sets
Instruction for converting a CBS 205 to 21 inch CRT
Remington Rand Television Bomb
Eidophor pictures
 
May 31
Vitascan picture
Prewar Database updated: Westinghouse WRT-703 added
Mechanical Database updated: Baird 1933 mirror drum added
Baird 1933 Mirror Drum
 
May 29
Zenith field sequential receiver
WOSU-TV remote bus
 
May 23
Panoramic images of the museum's collection
Wayne Bretl's Pictures of the convention
Archive of video coverage of the convention (Courtesy of Dave Sica)
 
May 21
2013 Early Television Convention Report
 
May 7
More on Canadian Home Made Iconoscope camera
 
May 6
Canadian Home Made Iconoscope camera
 
May 5
More pictures of RCA ITV-1 camera
Labor TV in Chicago
 
Apr 27
Color Database updated: RCA 21CT55 added
 
Apr 26
Color Database updated: Motorola 19CT1, RCA CTC-4 added
New Acquisition: RCA ITV-1 Industrial Vidicon Camera and Monitor
 
Apr 25
Prewar Database updated: 3 - RCA TRK-12/120s added
 
Apr 15
Color Database updated: RCA 21CT55 added
Prewar Database updated: Cossor 1210 added
 
Apr 13
Life Magazine photos of CBS 1951 color program
Mallory 1945 TV ad
Crosley 9-403MA ad
Philco 48-1001 ad
General Electric 1944 Synchro-lite ad
 
Apr 11
Reminder: The Convention is about a month away. If you plan to attend, please register.
Lee Radio & Television - Fremont, NE
First TV Broadcast in Romania (1938)
Radio-Television Institute (New York)
First National Television 1936 Christmas party
WGN transmitting antenna, 1948
 
Apr 9
2013 Article from The Institution of Engineering and Technology about the Emitron
Convention auction rules posted
 
Apr 6
Videodyne 10-FM chassis photo
1940 RCA Service Company card
 
Apr 4
TV equipment in RCA Broadcast Equipment Catalog - 1939 (courtesy of Cliff Benham)
TV Test equipment in 1939 RCA Broadcast Equipment Catalog(courtesy of Cliff Benham)
 
Mar 26
Thomson-CSF field sequential system
One Tank Trips, WJW Cleveland
 
Mar 25
More auction items for the 2013 Convention, including a CT-100
 
Mar 24
Another RCA CT-100 for sale
 
Mar 19
Wm. J. Stuebing Television and Appliance Store, Glouchester, NJ
National Radio School (Cleveland)
 
Mar 13
GE one tube color camera
A T & T network, 1952
DuMont 19 inch color CRT
Professional Charges for TV Service
Coin operated GE receiver
NRI kit photo
GE Octagon replica photo
 
Mar 12
Spanning the Continent by Radio Relay
Petruff Radio-Television, Miami
 
Mar 10
Auction items for the 2013 Convention
 
Mar 7
RCA CT-100 for sale
 
Mar 4
Prewar, rare postwar and early color sets for auction
Prewar Database updated: HMV 904 added
 
Feb 28
More on restoration of the DuMont Industrial Monitor
 
Feb 26
Pictures of a Midwest console from 1950
 
Feb 24
Revised RCA Model 5 serial numbers from Pete Deksnis
 
Feb 23
Revised CTC-2 serial numbers from Pete Deksnis
 
Feb 22
Midwest JR-32 advertisement
 
Feb 21
Articles about Videograph Television Jukebox
Color Database updated: Westinghouse H840CK15 added
 
Feb 20
Sony Chromatron sets
 
Feb 19
Massachusetts Television Institute 1939 camera
 
Feb 17
Picture of 1948 graduating class of the American Radio Institute
Basic Television Restoration (from Radios-TV.co/uk)
 
Feb 13
Prewar Database updated: RCA TRK-12/120 added
 
Feb 12
Article about 19 inch Motorola color sets
 
Feb 11
More on restoration of the DuMont Industrial Monitor
 
Feb 10
Transvision field strength meter
 
Feb 5
More progress on the RCA CPA prototype
 
Feb 4
Prewar Database updated:Farnsworth 9 inch console added
 
Feb 3
CBS 12CC2 Replica
 
Feb 1
Japanese paper on 21CYP22
Color Telerama - Cliff Benham's giant color wheel set
 
Jan 29
DuMont RA-103D Rumson
KTLA televises atomic bomb blast - 1952
 
Jan 28
More on restoration of the DuMont Industrial Monitor
Transvision
Surviving mechanical, prewar and color sets added during 2012
More information on W3XWT
Prewar Database updated: RCA TRK-5 added
 
Jan 26
Pacifica Network interview
 
Jan 23
Online registration for the 2013 Early Television Convention (May 17-19) is now available. We also have room for more presentations.
 
Jan 21
New acquisition: Midwest JR-32
 
Jan 20
New acquisition: Sylvania Dualette
 
Jan 19
Last mystery of the RCA CPA prototype solved - Automatic field one detection
 
Jan 11
1941 patent on Mexian field sequential system
 
Jan 8, 2013
Mexican field sequential system