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Union Switch & Signal : ウィキペディア英語版
Union Switch & Signal

Union Switch and Signal (US&S) was a supplier of railway signaling equipment, systems and services in Pittsburgh, Pennsylvania. As of January 1, 2009, US&S is known as Ansaldo STS USA.
==History==

George Westinghouse founded Union Switch & Signal in 1881, consolidating the assets of the Union Electric Signal Company (founded by track circuit inventor William Robinson) and the Interlocking Switch & Signal Company (which had pioneered interlockings).〔Ansaldo STS. ("History of Ansaldo - key milestones." ) Accessed 2011-07-12.〕 In 1925 US&S acquired the Hall Signal Company, primarily to obtain the latter company's patents for searchlight signals.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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