The SW-3 -- the receiver that started nine out of ten old timers in amateur
National's HFC 54-60 Mc converter (center) shown in an early 5 meter
Early experiments in television -- the National "Flying Spot" scanner,
about 1921. [This same picture appeared in QST June, 1928. The receiver is a SW-2.]
A mobile version of the SW-45 -- the object in the center of the photo must
be the "grip-to-talk" switch!
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