| 摘要 |
A lock with a combination selecting mechanism for releasing is constructed by a U-shaped shackle and a locking bar. A combination selecting mechanism is provided in the locking bar. The lock can be released by selecting the correct number series on the tumblers. A combination change control mechanism is further provided in the combination selecting mechanism, so that the combination can not be reset when the combination change control mechanism is in effect, thereby it is possible to avoid an undesired combination change.
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