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2. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.

3. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   Any fire doors which are normally held open must automatically close and lock when a fire is present in the building. The function of an emergency exit rim device (crash bar or panic bar) will permit escape through a fire door, however it must re-latch once released. (A fire door must not be "dogged" to disable its latch.)

4. Drawbar (defense) - Wikipedia

   en.wikipedia.org/wiki/Drawbar_(defense)

   A drawbar is a defensive implement used to secure a door or gate in a medieval or Early Modern building such as a castle, [1] [2] but also churches and townhouses.. When drawn across the full length of the door, it prevents the door or gate from being opened.

5. Door breaching - Wikipedia

   en.wikipedia.org/wiki/Door_breaching

   For doors, a shove knife can be wedged into the door jamb and open the latch bolt without having to deal with the lock itself. [3] Another option is to remove the cylinder lock from the door using instruments like an A-tool or K-tool; these methods also allow the door to be closed and re-locked afterward. [3]

6. Officer's tool - Wikipedia

   en.wikipedia.org/wiki/Officer's_tool

   An officer’s tool (also known as an A-tool, rex tool, or lock puller) is a forcible entry device used by firefighters and other first responders. Officer’s tools are designed to completely remove cylindrical locks from doors without causing major structural damage, allowing for direct access to the internal locking mechanism.

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9. Carl Prinzler - Wikipedia

   en.wikipedia.org/wiki/Carl_Prinzler

   Carl Jacob Prinzler (June 6, 1870 – May 30, 1949) was an American engineer who invented the "panic bar" device for doors that allowed them to be opened from the inside despite being locked on the outside.