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Elevator

Description: Patent for an elevator which locks itself should the hoisting cable break. Illustrations included.
Date: April 18, 1911
Creator: Ballard, Silas
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Advertising-Machine

Description: Patent for an advertising machine for displaying various advertising cards in a motorized machine that displays all the different cards as it goes around in a circle.
Date: April 18, 1911
Creator: Helm, Virgil L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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