Sold For $2,276
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Ballpoint signatures of William Shockley, Walter Brattain, and John Bardeen on a white 5 x 3.5 card carrying a block of four 8¢ 'Progress in Electronics' postage stamps. The three were awarded the 1956 Nobel Prize in Physics for 'researches on semiconductors and their discovery of the transistor effect.' In fine condition, with toning to corners.
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