#cylinder_lock  a lock in which a cylinder rotates to move bolt; tumblers are pins; inserting the key lifts and aligns the pins to free the cylinder to rotate
  supertype:  lock.holdfast  a fastener fitted to a door or drawer to keep it firmly closed
  part:  pin.tumbler  cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown

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