![]() A setup chart for hold & vary systems contains the top master key cuts and a key bitting array listing of the change key cut choices which can be used in each space on the change keys. This provided one master key cut and four remaining cuts which could be used for the change keys. By coincidence, popular key systems such as Sargent, Yale and Schlage used a 10 depth increment system and a two-step progression. ![]() Hollis Devine is often credited with developing a master key system in the 1960s which is known under various names such as The Quadrant System or Hold & Vary. When a customer required floor master keys or if all change keys had to operate a vestibule door, these key systems were not very helpful. The problem with these one-size-fits-all master key systems was that it was just a list of change keys. ![]() At least then there were more code systems to choose from. Several enterprising locksmiths later published books of master key systems. If a second master key system was required, we reversed the cuts tip to bow and used the same Reed master key system one more time. As the same cuts were used over and over again, notes written in the margins showed what keyways had already been used. My early recollections of developing master key systems included the use of a master key system printed in the beginning pages of the leather-bound Reed Code Book.
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