This is a Telezoom remote control for a 1948 Garod 10TZ20 TV set. It
was attached to the set by a 20 foot cable. When the button was
pushed, the picture was made larger, cropping the sides, top and bottom.
From a 1949 issue of Radio-Electronics magazine: "There are several
innovations which add to the convenience and satisfaction of the viewer.
One of the most interesting of these, introduced recently by the Garod
Radio Corporation, is known as Tele-Zoom, a name that suggests the Zoomar
lens which travels from a distant to a closeup view in a second or so.
Tele-Zoom effectively does the same and the "zoom" is controlled by the
This remote control is for an early 50s DuMont set. It was attached
by the long cable shown in the picture. It controlled the channel
number (using the telephone-like dial), the volume, brighness, and
turned the set on and off.