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The even digits are likewise, on the right side. Generally, keyways are identified by four non-zero digits in ascending order. In a large master key system, keys with fewer than four protrusions can be used to enter more than one keyway. For example, key blank 1460 will fit lock cylinder 1246, 1346, 1467, etc.
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.
Walter Reinhold Schlage (1882–1946) was a German-born American engineer and inventor. Known as the Lock Wizard of Thuringia , he is best known for the bored cylindrical lock and the lock company that bears his name, Schlage Lock Co.
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]
Allegion plc is an American Irish-domiciled provider of security products for homes and businesses.. Though it comprises thirty-one global brands, including CISA, Interflex, LCN, Schlage and Von Duprin, the company operates through two main sections: Allegion International and Allegion Americas. [4]
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 ...