| 摘要 |
PROBLEM TO BE SOLVED: To further enhance the burglarproof performance of a door with a lock by preventing an outsider from dishonestly unlocking the lock by drilling a hole in the vicinity of a thumb-turn. SOLUTION: A burglarproof plate 1 is made of a plate material which cannot be drilled or hardly drilled by a drill, and has such a size as to be pasted on or embedded in the vicinity of the thumb-turn 7 of the door 3. COPYRIGHT: (C)2005,JPO&NCIPI
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