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2. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

3. 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 ...

4. Safety (firearms) - Wikipedia

   en.wikipedia.org/wiki/Safety_(firearms)

   A decock/safety is a combination manual safety switch and decocking lever. Two popular variants exist. In the "three-way" system, made popular by Heckler & Koch pistols, the handler may decock the firearm by pushing down on the safety lever from the "Fire" setting, or engage the safety (even on a cocked firearm) by pushing the lever upwards.

5. Sentry Group - Wikipedia

   en.wikipedia.org/wiki/Sentry_Group

   The factory side entrance of the Linden Avenue plant in Rochester, NY. At the base of the silos are a furnace (used to fire-test safes) and a rock pit (used for drop-testing safes from a height of 30 ft.) Brush & Co. moved into a new plant at 900 Linden Avenue in Rochester in 1968, with over 50,000 sq ft (5,000 m 2). In 1987, it began doing ...

6. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   A safe sequence of operations is enabled through transfer of keys that are either trapped or released in a predetermined order. For example, a key is used to isolate a power source (circuit breaker or supply valve), this key is then released and can then be used to gain access through a gate or door to a high risk area by inserting it into an ...

7. Lock (firearm) - Wikipedia

   en.wikipedia.org/wiki/Lock_(firearm)

   Side-by-side shotguns and hunting rifles continued to use side-locks until the advent of the boxlock patented by Anson and Deeley in 1875. Side-lock shotguns have two separate lock plates mounted to the sides of the butt of the gun and not the receiver. In the boxlock, the components of the firing mechanism are contained within the frame of the ...