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electronics progress design type

  • Colnect-3169-011-Marconi-s-Spark-Coil-and-Spark-Gap.jpg
  • Colnect-3169-012-Transistors-and-Printed-Circuit-Board.jpg
  • Colnect-3169-013-Progress-in-Electronics.jpg
Short desc: electronics progress




Used by 3 stamps: (See all uses as list)

United States 7/10/1973 6c issue=Progress in Electronics d=Marconi spark coil & gap perf=11
United States 7/10/1973 8c issue=Progress in Electronics d=printed circuit board perf=11
United States 7/10/1973 15c issue=Progress in Electronics d=early microphone, radio tube, TV camera tube, radio speaker perf=11




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