Toy: US Postage Stamps, 1973, Progress in Electronics, Transistors & Circuit Board, S# 1501, Plate Block of 4 8 Cent Stamps
Toy: Progress in Electronics 6, 8, 11 and 15 Cent Stamps, Scott #S 1500-02 and C86
Toy: Progress in Electronics Transistors Set of 4 x 8 Cent US Postage Stamps 1501
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Toy: US Postage Stamps, 1973, Progress in Electronics, Transistors & Circuit Board, S# 1501, Plate Block of 4 8 Cent Stamps by US Postal Service - US Postal Service
Entertainment Memorabilia: JOHN BARDEEN - AUTOGRAPH LETTER SIGNED 12/27/1976
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