Image Colnect-198-352-Marconi--s-Spark-Coil-and-Spark-Gap.jpg
(200 x 124 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/images/b/198/352/Marconi--s-Spark-Coil-and-Spark-Gap.jpg Uploaded November 20, 2012, 10:53 pm by Stan Shebs |
