Image Colnect-3169-011-Marconi-s-Spark-Coil-and-Spark-Gap.jpg
(1024 x 645 pixels) |
Type: stamp Issuer: United States Date: 1973 Denom: ?
Visibility: public Image owner: none postage 7/10/1973 6c multi issue=Progress in Electronics dt=electronics progress d=Marconi spark coil & gap 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/3169/011/Marconi-s-Spark-Coil-and-Spark-Gap.jpg Uploaded May 19, 2016, 3:42 pm by Stan Shebs |
