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1987
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czechoslovakia diagram envelope formula function graph hall historic horologe knowledge letter mail mathematics maths message old ology philately physics plot postage postcard postmark prague relationship retro science seal sign stamp study superficies surface theory timepiece town vintage zodiacPrague Town Hall Mathematical Clock And Theory Of Functions Diagram Editorial Image
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Title
Prague town hall mathematical clock and theory of functions diagram #136055704
Description
CZECHOSLOVAKIA - CIRCA 1987: stamp printed by Czechoslovakia, shows Prague town hall mathematical clock and theory of functions diagram, circa 1987
This image is editorial
