| 摘要 |
A key-operated lock having a locking bolt or tongue having a latch position and a bolt locked position, and including a locking plug with means for holding the locking plug in either tongue-locked or tongue-free condition; the locking tongue in bolt locked position extending to a greater than normal extent to present a flat flush surface to the door jamb to prevent retraction of the tongue by means of an instrument at the front of the door.
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