Fundamentals of Master Keying Book

Description

Fundamentals of Master Keying book by Jerome Andrews
Widely regarded as the definitive guide and reference book on master keying pin tumbler cylinders.  Plain, easy to read text walks the reader step by step through the process of designing, creating, and implementing systems from simple 2-level master key systems like those used in apartment complexes to multi-level systems for larger facilities.
The ultimate reference for locksmiths or building maintenance personnel tasked with creating and maintaining master key systems.