Magnetic Door Locks : Electromagnetic Lock
Quote from Article entitled Magnetic Door Locks:
If an intruder was able to open the door once with a simple electromagnetic lock, he can easily do it again. For this a lock and a strike are glued with scotch tape or adhesive that weakens the contact and a door will open when force is exerted. This problem is easy to solve in many handles. Their scheme includes elements that prevent incomplete locking using an audio signal.
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