Telephone transmitters (microphones) are connected to each tank with receivers located in the pilot house. ... Since 1915 the manual block signal mileage has fallen off because of many roads substituting automatic block in place of the ... SlGNALlTE.aTrade name for attachment plug manufactured by Harvey Hubbell, Inc.. Bridgeport. Conn. SlGNALOlD. ... Trade name for bellringing transformers manufactured by the Amrevo Ea#39;ectric Co., 2309 Archer Ave., Chicago, Ill. SIGNALS.
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