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2. Lock and key - Wikipedia

   en.wikipedia.org/wiki/Lock_and_key

   A typical modern padlock and its keys. A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, security token or coin), by supplying secret information (such as a number or letter permutation or password), by a combination thereof, or it may only be able to be opened from one side, such as a door chain.

3. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   Pin tumbler lock. A common type of pin tumbler lock, of the euro cylinder type. The pin tumbler lock, also known as the Yale lock after the inventor of the modern version, is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key . Pin tumblers are most commonly employed in cylinder locks ...

4. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   Padlocks with modular locking mechanisms can often be taken apart to change the tumblers or to service the lock. Modular locking mechanism cylinders frequently employ pin, wafer, and disc tumblers. Padlocks with modular mechanisms are usually automatic, or self-locking (that is, the key is not required to lock the padlock)

5. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   Master keying. Master key turning a pin tumbler lock with two shear points. A master key operates a set of several locks. Usually, there is nothing different about the key. The differences are in the locks the key will operate. These master-keyed locks are configured to operate with two, or more, different keys: one specific to each lock (the ...

6. Slaymaker lock company - Wikipedia

   en.wikipedia.org/wiki/Slaymaker_lock_company

   The lock company, Slaymaker, Barry and Company, was founded in 1888 by Samuel R. Slaymaker and John F. Barry of Connellsville, Pennsylvania. Samuel Slaymaker had become interested in switch and signal locks while working for the Pennsylvania Railroad as a civil engineer. In 1894 the company was reorganized and renamed the Slaymaker–Barry ...

7. 10 Clever Year-Round Ways To Fit Back-to-School Shopping Into ...

   www.aol.com/10-clever-round-ways-fit-122103415.html

   Use Online Marketplaces. According to McCullough, popular websites like eBay and Facebook Marketplace are excellent for finding deals on back-to-school items. “Parents often sell items their ...