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2. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.

3. Arrow lock - Wikipedia

   en.wikipedia.org/wiki/Arrow_lock

   An arrow lock is metal and rectangular, measuring 2.005 in × 3.566 in × 0.620 in (50.9 mm × 90.6 mm × 15.7 mm) with a keyhole in the center. [2] When the user turns the key, a metal bar that normally protrudes from one side is moved through the lock to the other side.

4. Physical security - Wikipedia

   en.wikipedia.org/wiki/Physical_security

   Mechanical access control systems include turnstiles, gates, doors, and locks. Key control of the locks becomes a problem with large user populations and any user turnover. Keys quickly become unmanageable, often forcing the adoption of electronic access control.

5. Slaymaker lock company - Wikipedia

   en.wikipedia.org/wiki/Slaymaker_lock_company

   Slaymaker Lock Company was a manufacturer of locks founded in 1888, which for a time made steam-powered automobiles. The company invented many unique inexpensive locks and were famous for their warded padlocks.

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