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in subjects: "Science and Technology - Tools"  
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Sheet-Placing Machine.

Description: Patent for improvements in sheet-placing machines for pushing and pulling devices to their correct orientation of oil tanks (lines 10-13) roof construction without the possibility of injury to mechanics.
Date: March 13, 1923
Creator: Brock, Verita Belle
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculator.

Description: Patent for a calculator "in which a bar having a series of numbers thereon slides in a frame or base also provided with a series of numbers" (lines 10-12). It is meant for quickly adding numbers.
Date: October 13, 1896
Creator: Copeland, Wesley Albert & Roberts, Cyrus
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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