Caption: Edison Carbon Transmitter and Chalk Receiver, Restored and on Display at Reconstructed Menlo Park Laboratory in Dearborn, Michigan; Dearborn, MI; March 29, 1940; {34.000/14} (jpg).
Caption: Edison Carbon Transmitter and Chalk Receiver, Restored and on Display
at Reconstructed Menlo Park Laboratory in Dearborn, Michigan; Dearborn, MI;
March 29, 1940; {34.000/14} (jpg).