Early Electronic Television
General Electric HM-171
(click on picture for high resolution image)
This set was introduced in 1939. It has a 5 inch screen, but to get the audio, it had to be connected to a separate radio. Many radios made in 1939-41 included a connection on the back for television.
Here is a photo of the set in operation
The General Electric H640 radio, made with a TV audio input connector, for use with the HM-171 television receiver