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Lock-Nut.

Description: Patent for a lock-nut which prevents the nut from accidentally rotating on the bolt, including illustrations. The nut is locked in position when a locking key is introduced to grooves on the lower surface of the nut and the adjacent face of the washer.
Date: February 13, 1906
Creator: Crawford, Hezekiah H.
Partner: UNT Libraries Government Documents Department

Toy Gun

Description: Patent for a toy gun. Illustrations included.
Date: April 13, 1909
Creator: Griffith, Jesse B.
Partner: UNT Libraries Government Documents Department

Reciprocating Electric Engine

Description: Patent for "means for employing an ordinary continues current from a suitable source to produce an oscillating primary magnetic field of a solenoid-magazine and to use said magnetic field for setting a piston-like armature in a reciprocal axial motion to develop mechanical power in both directions" (lines 11-17).
Date: June 13, 1905
Creator: Wagner, Bruno Otto
Partner: UNT Libraries Government Documents Department
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