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in subjects: "Science and Technology - Tools"  
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Wrench

Description: Patent for a pipe and nut wrench. Illustrations included.
Date: May 7, 1912
Creator: Wood, Hezekiah M.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Ladder.

Description: Patent for a ladder that will allow its prop legs to be slided longitudinally of the main ladder legs to form an extension ladder.
Date: May 23, 1912
Creator: Vierheller, Paul E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Hoisting-Machine

Description: Patent for a new Hoisting-Machine. The Hoisting Machine has improved arrangement of parts that control the device's braking drum. Improving the Hoisting Machine construction is useful for reducing wear on the machine.
Date: May 21, 1912
Creator: Johnston, Horace
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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