Description: 411 expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener / 411 expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener/(190) having structure to restrict rotation of threaded, mating pieces (e.g., nut lock) (321) with an elongated member in the nature of a rotation preventing key disposed axially of the threaded elements (322) and utilizing a resilient characteristic of the key, or of a discrete element
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