Bell Telephone Company companies and to provide further funds for expansion of its overall telephone infrastructure. On April 17, 1880, National Bell was split into the American Bell Telephone Company, led by Theodore Vail as general manager, and with the International Bell Telephone Company (IBTC) as a holding company for its international subsidiaries. IBTC's first non-North American subsidiary was the Bell Telephone Manufacturing Company (BTM), established by Hubbard at Antwerp, Belgium, in 1882. The Bell System's Bell Telephone Company of Canada subsidiary, wholly owned by the National Bell, had been established two years earlier. Alexander Graham Bell's ten shares of Bell Telephone Company
Bell Labs of American Telephone & Telegraph Company and Western Electric. Researchers working at Bell Labs are credited with the development of radio astronomy, the transistor, the laser, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages C, C++, and S. Nine Nobel Prizes have been awarded for work completed at Bell Laboratories. In 1880, the French government awarded Alexander Graham Bell the Volta Prize of 50,000 francs, approximately US$10,000 at that time (about $ in current dollars) for the invention of the telephone. Bell used the award to fund the Volta Laboratory ("Alexander Graham Bell Laboratory")