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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 ...
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.
A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.
The U.S. General Services Administration sets standards for locks and containers used to store classified material. The most commonly-approved security containers resemble heavy-duty file cabinets with a combination lock in the middle of one drawer. In response to advances in methods to defeat mechanical combination locks, the U.S. government ...
A realtor lock box hanging on the doorknob of a house for sale A real-estate lock box is a padlock -shaped box that generally hangs around the doorknob of a house that is on the market . The device holds the keys to a house to allow common access for all real estate agents , while continuing to keep them secure. [ 1 ]
OKLAHOMA CITY — The Oklahoma State Board of Education on Tuesday approved a proposal requiring parents to report their immigration status or proof of citizenship when enrolling their children in ...
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