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AT&T Bell Laboratories A premiere source of American inventions, Bell Laboratories has more than 22,000 patents to its credit, an average of more than one each day during the past 63 years. Perhaps the most significant single invention was the transistor, developed at Murray Hill in 1947. Other inventions include the superheterodyne broadcast radio receiver, the rhombic antenna for radio telephony, the horn-reflector antenna used on microwave relay towers, microwave transmission technology, optical fiber transmission systems, molecular beam epitaxy, gas and semiconductor lasers, the UNIX operating system, C language for computer software systems, magnetic bubble technology, charge-coupled devices, the touch tone telephone, and cellular radiotelephony. Seven Bell Labs scientists have been awarded Nobel Prizes, and the company was the first corporate recipient of the President's National Medal of Technology.