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Secondary key aiding principal key working - has fitting into barrel end of principal key allowing operation from opposite side of door
Secondary key aiding principal key working - has fitting into barrel end of principal key allowing operation from opposite side of door
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机译：辅助钥匙辅助主钥匙工作-安装在主钥匙的枪管端部，允许从门的相反侧进行操作
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摘要
The principal key has at the end of the barrel away from the grip, a deep central rectangular bore that allows the penetration of a second flat key, so that the latter can work the principal key from the opposite side of the door.
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