#lever_tumbler__levertumbler__lever  a flat metal tumbler in a lever lock
  supertype:  tumbler.obstructor  a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown
  part of:  lever_lock__leverlock  a lock whose tumblers are levers that must be raised to a given position so that the bolt can move

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