TheHall Signal Company was an American manufacturer ofrailway signaling equipment in the 19th and 20th centuries. Hall's equipment was widely used by American railroad companies. The company's founder,William Phillips Hall, was an inventor who developed several important devices in the history ofrailway signalling. The company manufacturedautomatic block signaling systems,disc signals (also called "banjo" signals), a rotatingsemaphore signal,grade crossing signals, and the firstsearchlight-style signal.[1][2]: 52
The company was established in 1871 with main offices inNew York City and a factory inMeriden, Connecticut.[3] In 1892 it built a new, larger factory inGarwood, New Jersey.[4] The company reorganized in 1912 to raise capital and expand its Garwood factory.[5] In 1925 Hall Signal Co. was purchased byUnion Switch and Signal, principally for the value of its searchlight signal patents.[2]: 36–37
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