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Source:
Colnect
Issued by:
United States
Function:
postage
Date:
7/10
/
1973
Issue:
Progress in Electronics
Denom:
6c
Color:
multicolored
Design type:
electronics progress
Design:
Marconi spark coil & gap
Watermark:
unwmk
Perf:
11
Catalog value:
In collections:
used
(Stan Shebs)
Prev:
7/4/1973 8c dt=Boston Tea Party d=boat & dock
Next:
8c d=printed circuit board
External links:
Colnect 93026-..tes_of_America
Record of changes
