Three Nobel Prize winners for their invention of the transistor. Three items: ink signatures of John Bardeen and Walter Brattain on individual off-white cards; and an original signed ink sketch of a transistor circuit by William Shockley on a light blue card. All three are matted together with a magazine photo of the three, to an overall size of 11.75 x 11.75. In very fine condition. R&R COA.
