1 Matching Results
Results open in a new window/tab.
Results:
1 - 1 of
1
Improvement to Elevator Signal Systems
Patent for an improvement to an elevator in which “to provide an elevator signal system that will permit a party at any landing to indicate his desire to go up or down to the elevator operator by pressing one of two buttons” (lines 10-15). Instructions and illustration included.
Date:
February 2, 1915
Creator:
Johnson, Charles S.
System:
The Portal to Texas History