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in subjects: "switches"  
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Electric Switch

Description: Patent is for electric switch that minimizes other phone interference and limits each call to a single caller on the line. Two lines can be connected to the switch.
Date: December 4, 1917
Creator: Teare, J. W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Switch.

Description: Patent for a switch mechanism for use on railroads. The switch can be installed without cutting the railroad tracks. Instructions and illustrations are included.
Date: March 20, 1917
Creator: Allen, Gus V.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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