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I found this on the ETF Website:
During late 1935 and early 1936 RCA manufactured a few nine-inch field test television receivers, including the RR-359 in our collection. The RR-359 started as a 9-inch mirror-in-the-lid set... Initially the set scanned 343 lines (interlaced) and had a continuous tuner capable of tuning 40 to 90 MHz which frequencies include the current low-band VHF channels 2 to 6 and below to the now defunct channel 1...
In 1937, RCA and other experimental broadcasters moved up to 441-lines, AM sound. This was the RMA (Radio Manufacturer’s Association) standard at the time. It is probable that RCA transferred its old call sign W2XBS for these broadcasts. Programming was extended to include pickups remote from the studio. NBC’s mobile television vans, then a great curiosity, appeared on the streets of New York for the first time on December 12, 1937.
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