| 摘要 |
PROBLEM TO BE SOLVED: To provide a pin cylinder lock allowing an increase in the number of different keys. SOLUTION: The body section 2 of a master key 1 is a round bar with a circular cross section. A recess 4 for engagement with a tumbler pin is two- dimensionally extended along the directions of the generating line and the circumference of the outer peripheral surface of the body section 2.
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