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Nut Lock.

Description: Patent for a new and improved nut lock. This design consists in "[a] lock . . . for a nut having a non-circular recess in its rear face, consisting of a washer having a non-circular opening whereby it may be keyed upon a bolt and fitted to enter the non-circular recess of a nut, and a securing-plate having an opening fitted to receive the locking-washer" (lines 81-87).
Date: June 15, 1886
Creator: Unger, Louis
Partner: UNT Libraries Government Documents Department