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Hair Clipper.

Description: Patent for hair clippers that simplifies construction, reduces vibration, and improves efficiency.
Date: May 16, 1922
Creator: Monroe, Collier
Partner: UNT Libraries Government Documents Department

Automatic Train-Stop

Description: Patent for Automatic Train-Stops "particularly to a system operable in connection with well-known airbrake systems to apply the airbrakes, and shut off the power when an accident of a predetermined character occurs." (lines 10-14) including instructions and illustrations.
Date: May 16, 1916
Creator: Estes, Betram P.
Partner: UNT Libraries Government Documents Department

Improvement in Portable Derricks.

Description: Patent for improvement in portable derricks by using an “adjustable crane mounted on a truck-platform, having an overhead frame for the support of the upper end of the crane-post, and braces for staying the frame, so that the crane can be turned around to overhang the sides.” (Lines 6-11) Illustration is included.
Date: May 16, 1876
Creator: Reams, Shirwood Y.
Partner: UNT Libraries Government Documents Department
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