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John L Schum

JOHN L. SCHUM is the author of Learn About...Electronic Locking Devices and Learn About...Basic Electricity , published by Locksmith Publishing Corporation. He writes technical articles for trade magazines and has given numerous seminars throughout the United States and Canada for various trade groups. He also has been a program speaker at several security industry conventions. John is a certified instructor for the Associated Locksmiths of America and has instructed for Yankee Security...See more