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slide rule & calipers & atom symbol

  • Colnect-4398-526-Slide-ruler-slide-gauge---atomic-model.jpg
  • Colnect-4398-529-Slide-ruler-slide-gauge---atomic-model.jpg
Short desc: slide rule & calipers & atom symbol




This design is used by 2 stamps: (See all uses as list)
5/29/1957 55b bl
5/29/1957 55b brnred

All are Romania issue=2nd Engineers & Technicians Congress wmk=RPR mult endless perf=14x14.5






Record of changes


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