Progress in Electronics
- Made:
- 1973
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© The Board of Trustees of the Science Museum
Three stamps, (used) from a set of four, 'Progress in Electronics', 8 cents stamp Modern Transistor circuit, 11 cents airmail stamp De Forest Audions (1915), 15 cents stamp [early microphone, television camera tube, radio speaker] issued in United States of America (USA) 1973
