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BURGLAR-PROOF
The most obvious entrance for a burglar into most homes is via the front or rear exterior doors. A burglar can open an ordinary snap lock fairly easily with a thin sheet of plastic or metal. On all hinged exterior doors, you should use a dead-lock. In this, a separate pin on the flat side of the latch tongue stays stuck in the strike even when a burglar pushes back the latch tongue.
Locks with a dead-bolt that is operated by a thumb-turn from the inside are equally effective; but, of course, they do not lock a door automatically.
For maximum security, you can equip exterior doors with an automatic
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