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Source:
Colnect
Issued by:
Czechoslovakia
Function:
postage
Date:
12/7
/
1959
Denom:
30h
Color:
multicolored
Design type:
radio & telegraph inventors
Design:
Popov
(1959)
Watermark:
unwmk
Perf:
11.75x11.25
Catalog value:
In collections:
used
(Stan Shebs)
Prev:
25h d=Nikola Tesla (1959)
Next:
35h d=Branly
External links:
Colnect 134030..Radioinventors
Record of changes
