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2. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

3. Locksmithing - Wikipedia

   en.wikipedia.org/wiki/Locksmithing

   Locks have been constructed for over 2500 years, initially out of wood and later out of metal. [1] Historically, locksmiths would make the entire lock, working for hours hand cutting screws and doing much file-work. Lock designs became significantly more complicated in the 18th century, and locksmiths often specialized in repairing or designing ...

4. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   The most remarkable is the shear lock, where the armature does not directly pull off the face, but the load is instead in shear, like a mechanical stop. The shear magnetic lock allows a door to swing in both directions, as opposed to the original (and now ubiquitous) direct pull type, which normally works either in an in-swing or out-swing ...

5. Electronic lock - Wikipedia

   en.wikipedia.org/wiki/Electronic_lock

   The key contains a power supply device, usually a rechargeable battery or a replaceable battery in the key, used to drive the system to work; it also includes an electronic storage and control device for storing the identification code of the lock. The software is used to set and modify the data of each key and lock. [2]

6. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   With a key properly cut and inserted into the groove on the end of the plug, the pins will rise causing them to align exactly at the shear point. This allows the plug to rotate, thus opening the lock. When the key is not in the lock, the pins straddle the shear point, preventing the plug from rotating. Euro profile locks, an example of a ...

7. 13 Things You Should Never, Ever Carry in Your Wallet - AOL

   www.aol.com/finance/13-things-never-ever-carry...

   6. Spare Keys. Spare keys in your wallet might seem like a good idea — until you lose them. Now, some random guy could be two steps away from showing himself in. Better call: leave a spare with ...