Image Colnect-3168-984-Edwin-Armstrong-and-Frequency-Modulator.jpg
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Type: stamp Issuer: United States Date: 1983 Denom: ?
Visibility: public Image owner: none postage 9/21/1983 20c multi dt=American inventors d=Edwin Armstrong unwmk perf=11 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/3168/984/Edwin-Armstrong-and-Frequency-Modulator.jpg Uploaded May 19, 2016, 1:20 pm by Stan Shebs |
