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2. Deadbolt - Wikipedia

   en.wikipedia.org/wiki/Deadbolt

   Some lock manufacturers also have a "lockable" knob: a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), unless a button has been pressed, in which case a key is also needed on the internal side. [3] A variant of the standard deadbolt is the vertical deadbolt, invented by Samuel Segal.

3. Segal Lock and Hardware Company - Wikipedia

   en.wikipedia.org/wiki/Segal_Lock_and_Hardware...

   The vertical deadbolt lock eliminated a horizontal bolt, concentrating on the hinge principle. Segal had noticed that burglars forced locks but never hinges. The firm's beginning was aided by a few more policemen. The original capital was approximately $1,000. Segal and his associates refused $1,000,000 in cash for their fifty separate lock ...

4. Electric strike - Wikipedia

   en.wikipedia.org/wiki/Electric_strike

   Deadbolts, also known as deadlocks, do not have a spring mechanism which generally means the strike for a deadbolt is 'hold' only (the deadbolt is thrown and it engages in the electric strike cavity, the electric strike can release it but cannot subsequently 'recapture it' since the deadbolt lacks the spring latching capability of the other ...

5. Got Kids Who Always Forget to Lock Up? These Electronic ...

   www.aol.com/10-best-electronic-deadbolts-more...

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6. Night latch - Wikipedia

   en.wikipedia.org/wiki/Night_latch

   Historically, such locks were intended for use at night-time, hence the name. [5] The keyless egress that they offer is a valuable fire safety measure, but may be a security risk if breaking a glass panel (usually in the door) or a nearby small window allows an intruder to reach the knob inside and open the door from the outside.

7. Lockset - Wikipedia

   en.wikipedia.org/wiki/Lockset

   Metal fire-resistance rated door with a lockset consisting of a locking latch bolt operated by lever handle with an escutcheon that encompasses the locking mechanism.. A lockset (alternatively lock set) is the hardware and components that make up the locking or latching mechanism that can usually be found on a door or other hinged object but can also include sliding doors and dividers. [1]