Colnect-4398-529-Slide-ruler-slide-gauge---atomic-model.jpg
Source: Colnect
  • Colnect-781-448-Slide-ruler-slide-gauge--amp--atomic-model.jpg
Issued by: Romania
Function: postage
Date: 5/29/1957
Issue: 2nd Engineers & Technicians Congress
Denom: 55b
Color: brown red
Design: slide rule & calipers & atom symbol
Watermark: RPR mult endless
Perf: 14x14.5
Catalog value:



External links:
Colnect 211017..ians_Bucharest


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