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American inventors design type

  • Colnect-3168-984-Edwin-Armstrong-and-Frequency-Modulator.jpg
  • Colnect-3168-987-Philo-T-Farnsworth-and-First-Televison-Camera.jpg
  • Colnect-3168-983-Charles-Steinmetz-and-Curve-on-Graph.jpg
  • Colnect-3168-985-Nikola-Tesla-and-Induction-Motor.jpg
Short desc: American inventors




Used by 4 stamps: (See all uses as list)

United States 9/21/1983 20c d=Edwin Armstrong perf=11
United States 9/21/1983 20c d=Philo T. Farnsworth perf=11
United States 9/21/1983 20c d=Charles Steinmetz perf=11
United States 9/21/1983 20c d=Nikola Tesla (1959) perf=11




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