31. The transistor was invented at Bell Laboratories in 1947 by :
(a) John Bardeen
(b) Walter Brattain
(c) William Shockley
(d) All of the aboveSubject Name : Electronics Engineering Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant Electronics & Communication Engineering Books
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