| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe lock device never allowing the release of the lock state of a key with a simple structure. SOLUTION: In the key of the lock device for inserting the key to a keyhole to release the lock state of the key, a pit line 2 formed of irregularities readable by laser is formed on the flat part 1A of the key 1 along the longitudinal direction of the key 1.
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