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early microphone, radio tube, TV camera tube, radio speaker

  • Colnect-3169-013-Progress-in-Electronics.jpg
Short desc: early microphone, radio tube, TV camera tube, radio speaker


Things in this design:
manufacture microphone

This design is used by one stamp:
United States 7/10/1973 15c issue=Progress in Electronics dt=electronics progress perf=11






Record of changes


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