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Slide Show
slide rule & calipers & atom symbol
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
