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2. Skeleton key - Wikipedia

   en.wikipedia.org/wiki/Skeleton_key

   The normal key on the left will open only the lock that it goes to, but the skeleton key on the right will open any lock with this particular keyhole. Two warded lock keys and a homemade skeleton key A skeleton key (also known as a passkey [ 1 ] ) is a type of master key in which the serrated edge has been removed in such a way that it can open ...

3. 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]

4. 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 ...

5. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.

6. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   Industrial smart locks (passive electronic lock) are a branch of the smart lock field.They are an iterative product of mechanical locks like smart locks. However, the application areas of industrial smart locks are not smart homes, but fields that have extremely high requirements for key management, such as communications, power utilities, water utilities, public safety, transportation, data ...

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 ...