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Screw-cutting Die.

Description: Patent for a screw-cutting die, including illustrations. The invention includes "a die-plate of special construction, adapted to cut either right or left hand threads" (lines 12-13).
Date: February 6, 1883
Creator: Müller, Joseph
Partner: UNT Libraries Government Documents Department

Churn-Power.

Description: Patent for a new and improved motorized churn. This design "has for its object to provide a means for converting a rotary into a reciprocating movement and regulating the range of the reciprocating mechanism" (lines 15-18).
Date: February 24, 1880
Creator: Britain, Thomas J.
Partner: UNT Libraries Government Documents Department
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