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2. Interchangeable core - Wikipedia

   en.wikipedia.org/wiki/Interchangeable_core

   Interchangeable cores require a notch at the tip of each key to properly align the peaks and valleys of each blade with the combinating pins in the chambers of the mechanism; as a consequence, these keys are always configured and cut from blade tip to bow. Conversely, conventional cylinders and removable cores use a shoulder near the bow of ...

3. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   For example, master keyed pin tumbler locks often have two shear points at each pin position, one for the change key and one for the master key. A far more secure (and more expensive) system has two cylinders in each lock, one for the change key and one for the master key. Master keyed lock systems generally reduce overall security. [2]

4. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   Each tenant is given a key that only unlocks their own door, called the change key, but the second key is the master key, which unlocks all the doors, and is usually kept by the building manager, so they can enter any room in the building. In a master-keyed lock, some or all of the pin chambers in the lock have three pins in them instead of two.

5. Tubular pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

   A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.

6. Wafer tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Wafer_tumbler_lock

   Most wafer tumbler locks with poor tolerances can be opened with a set of jigglers or try-out keys. These sets of keys are designed with the most common patterns of key available. The key is inserted into the lock like a normal key, and a turning force is applied whilst the key is raked back and forth until the lock opens.

7. Change your clocks, change your batteries - AOL

   www.aol.com/change-clocks-change-batteries...

   Nov. 2—This weekend marks the end of daylight saving time and clocks will be turned back one hour on Nov. 5. This occasion also serves as a good time to check some important equipment in your ...

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9. Did you change your clocks? Now do this, too - AOL

   www.aol.com/falling-back-change-clocks-test...

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