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Source:
Colnect
Issued by:
Czechoslovakia
Function:
postage
Date:
12/7
/
1959
Denom:
2k
Color:
multicolored
Design type:
radio & telegraph inventors
Design:
circuit diagram
&
Edwin Armstrong
Watermark:
unwmk
Perf:
11.75x11.25
Catalog value:
In collections:
used
(Stan Shebs)
Prev:
1k d=Hertz
Next:
1/20/1960 30h dpsal&dkbrn issue=2nd Winter Spartacist Games d=gymnast (1960) perf=11.25x11.75
External links:
Colnect 134034..Radioinventors