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Czechoslovakian stamp honoring mathematicians and physicists
1987, 6 July (date of issue)
Postage stamp
Private collection of Krzysztof Slowinski
LL/36856
The stamp no. 2920 (Scott 2664) shows three mathematicians; the first from the left is Josef Petzval (1807 - 1891), inventor of the first portrait lens.
Catalog number: Michel 2918 - 2920, Scott 2663 - 2665
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