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Nut Lock.
Patent for a new and improved nut lock. This design calls for a grooved nut and bolt to hold a pin between the two while the bolt is screwed onto the nut. Depending on whether or not the pin is in said grooves, the nut may or may not be removed from the bolt, which increases the worker's control over the nut and bolt and prevents unintended loosening.
Date:
March 1, 1881
Creator:
Bunker, John Williamson
System:
The Portal to Texas History