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in creator/contributor: "McNabb, Alvin C."  
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Elevator Signal System

Description: Patent for an elevator signal system that can be installed in elevators which indicates "the floor positions of all the cars as well as the car carrying the indicator" (lines 10-12), including illustrations.
Date: July 30, 1918
Creator: McNabb, Alvin C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Elevator Signal System.

Description: Patent for an elevator signaling system that helps maintain proper spacing between elevator cars. This system provides signals to the elevator operator to allow him to know where all other elevator cars are located in real time.
Date: February 12, 1918
Creator: McNabb, Alvin C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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