| 摘要 |
PROBLEM TO BE SOLVED: To provide a disc tumbler lock having difficulty in illegal unlocking by picking. SOLUTION: A serration is formed along a bus bar of the circumferential surface of a guide pin 4 of the disc tumbler lock therein, and a serration groove capable of being engaged with the serration of the guide pin is formed in the side end edge of a tumbler 2 coming into contact with the guide pin.
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