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Safety-Catch for Mine-Cages

Description: Patent for a safety catch to stop falling mine cages.
Date: December 29, 1908
Creator: Martini, Henry
Partner: UNT Libraries Government Documents Department

Draft Device for Wheeled Gang Plows

Description: Patent for a draft device for wheeled gang plows. This invention is and improvement to equalize draft devices for motor drawn gang plows to avoid pulling the plow out of the straight line of draft. Illustration included.
Date: October 29, 1912
Creator: Weiler, Nicholas
Partner: UNT Libraries Government Documents Department

Activated-Sludge Treatment.

Description: Patent for a method that dehydrates sewage for easier removal.
Date: January 29, 1918
Creator: Moor, William C.
Partner: UNT Libraries Government Documents Department
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