Stamps, 2nd Engineers & Technicians Congress issue

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Romania

postage

1957, May 29 2nd Engineers & Technicians Congress issue wmk. RPR mult endless p. 14x14.5
Colnect-4398-526-Slide-ruler-slide-gauge---atomic-model.jpgColnect-4398-529-Slide-ruler-slide-gauge---atomic-model.jpg
- 55b bl slide rule & calipers & atom symbol
- 55b brnred slide rule & calipers & atom symbol

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