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  2. Edward W. Stack - Wikipedia

    en.wikipedia.org/wiki/Edward_W._Stack

    Edward W. Stack (born 1954/1955) is an American billionaire businessman. In 1984, Stack took over as chairman and chief executive officer (CEO) of Dick's Sporting Goods , a sports equipment retailing company founded in 1948 by his father, Dick Stack.

  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. Gun safety - Wikipedia

    en.wikipedia.org/wiki/Gun_safety

    A Glock 19 disarmed and secured for transport (or storage) with a cable lock through its receiver Firearm handling safety poster. Gun safety is the study and practice of using, transporting, storing and disposing of firearms and ammunition, including the training of gun users, the design of weapons, and formal and informal regulation of gun production, distribution, and usage, for the purpose ...

  5. Lock (firearm) - Wikipedia

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

    Lock (firearm) This flintlock mechanism is distinct from the metal barrel extending to the right, and the surrounding wooden stock encloses and obscures the trigger mechanism connection to the actuation spring. The lock of a firearm is the mechanism used to initiate firing. It is a historical term, in that it generally refers to such mechanisms ...

  6. ABA problem - Wikipedia

    en.wikipedia.org/wiki/ABA_problem

    In multithreaded computing, the ABA problem occurs during synchronization, when a location is read twice, has the same value for both reads, and the read value being the same twice is used to conclude that nothing has happened in the interim; however, another thread can execute between the two reads and change the value, do other work, then change the value back, thus fooling the first thread ...

  7. Primer (firearms) - Wikipedia

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

    Primer (firearms) In firearms and artillery, the primer ( / ˈpraɪmər /) is the chemical and/or device responsible for initiating the propellant combustion that will propel the projectiles out of the gun barrel . In early black powder guns such as muzzleloaders, the primer was essentially the same chemical as the main propellant (albeit ...

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