Electro-mechanical devices locksmith ledger pb 1971

Electro-mechanical devices locksmith ledger pb 1971

Title: Electro-Mechanical Devices - Author: Locksmith Ledger editors - 1971 - Publisher: Locksmith Ledger (Little Falls, NJ) - Soft Cover - Book/Jacket Condition: Very Good / (na) - ISBN: (na)
56-page saddle-stitched booklet. Lightly/moderately age-worn. Full of schematics, charts and diagrams. Very useful for the locksmith or locksport hobbiest. Articles on "How to Develop Your Own Electro-Mechanical Systems", "Designing a Central Control Panel", "Multi-Door Safety Locking System" and more.
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Questions welcome. Thanks for looking!