E21D 15/26
With screw, worm, or the like, not self-locking but normally prevented from
Official title: with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure
E21D15/26 (With screw, worm, or the like, not self-locking but normally prevented from) appears on 0 US grants and 0 published applications in this corpus.
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