| 摘要 |
A pin-tumbler lock and method of use thereof has an inside cylinder and conventional outside cylinder. The inside cylinder operates with a pin-tumbler key but cannot be operated by the key that operates the outside cylinder. The pin-tumbler key is retained automatically in the inside cylinder once inserted but can be manually released by using an appropriate tool. The inside cylinder retains the pin-tumbler key because the pins become misaligned when the pin-tumbler key is inserted. Previous locks can be a fire hazard or can be burglarized too easily.
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