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Title: Progress in Electronics [Go to resource]
Description: Three stamps, (used) from a set of four, 'Progress in Electronics', 8 cents stamp Modern Transistor circuit, 11 cents airmail stamp De Forest Audions (1915), 15 cents stamp [early microphone, television camera tube, radio speaker] issued in United States of America (USA) 1973 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: stamp Temporal: 1973 Source: Science Museum Identifier: 2001-465 Go to resource More Like this...
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