| 摘要 |
<p>Protection mechanism of the key hole of the lock of a door (11) consisting of a tough durable shell (1), within which a mechanism that drives a blade (4) to cover the key hole (11) is located, so that the key hole will not be visible to any attacker and will not be exposed to the weather conditions . The hitherto mechanisms let the key hole of the lock exposed.</p> |
