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2. The Master Key System - Wikipedia

   en.wikipedia.org/wiki/The_Master_Key_System

   The Master Key System is a personal development book by Charles F. Haanel that was originally published as a 24-week correspondence course in 1912, and then in book form in 1916. [1] The ideas it describes and explains come mostly from New Thought philosophy.

3. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   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 change key), which cannot operate any of the others in the set, and the ...

4. Master Lock - Wikipedia

   en.wikipedia.org/wiki/Master_Lock

   Master Lock is an American company that sells padlocks, combination locks, safes, and related security products. Now a subsidiary of Fortune Brands Innovations , Master Lock Company LLC was formed in 1921 by locksmith -inventor Harry Soref and is headquartered in Oak Creek, Wisconsin .

5. 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 ...

6. Charles F. Haanel - Wikipedia

   en.wikipedia.org/wiki/Charles_F._Haanel

   The Master Key System. 1912 (mail order course) The Master Key System. 1917 (book format). Mental Chemistry. 1922. The New Psychology. 1924. Variant editions of The Master Key System The Master Key System in 24 Parts. by Charles F. Haanel, edited by Anthony R. Michalski ISBN 0-9678514-0-8; The Master Key System: 28 Part Complete Deluxe Edition ...

7. 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.