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Nut-Lock.

Description: Patent for a strong, durable, and inexpensive nut lock that securely locks a nut onto a threaded bolt and can be easily unlocked. It also is simply constructed. It consists of a plank-like spring tongue that fits over the bolt and under the nut.
Date: November 28, 1893
Creator: Taini, John
Partner: UNT Libraries Government Documents Department