Lot 3 industrial RFL transmitters/signal osc-mod FS HB-24335-16

Lot of three industrial telecommunication radio transmitter modules. These are marked "FS transmitter", model number "HB-24335-16" and "1700Hz". They are marked on the backs "Signal OSC-MOD and BP Filter HB-59300", "RFL Industries - Boonton, NJ - HB-58800" and "BW 1200Hz - FS +- 500Hz)". They measure about 7" x 3 1/2" x 1 1/2" not including the handles.

These are from the estate of an industrial telecommunications engineer and ham radio enthusiast. We don't know much about them and we have not tested them.