Electro-mechanical locks
Subtitle: a study of basic electricity for locksmiths, concerning locking components operated by electrical power or battery.
Series: Locksmith Ledger technical publication -- no. 734
Publisher: Nickerson & Collins, Locksmith Ledger Div.
Published: 1971
Place of publication: Des Plaines, IL
Language: eng
Number of pages: 64
Subjects: Locks and keys.; Electromechanical devices.