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A schematic representation of three point lock. Three-point locking, or a multipoint lock, is a locking system installed in cabinet or locker doors to enable more secure locking. Whereas in single-point locking, the door on a cabinet locks only at the point where the key is turned, halfway up the edge of the door, three-point locking enables ...
Manual fire alarm activation. An activated manual call point in Japan. Telephone jacks are visible beneath the open cover. Manual fire alarm activation is the process of triggering a fire alarm through a call point, pull station, or other device. This usually causes the alarm to sound the evacuation signal for the relevant building or zone.
AA – Assembly area. AA – Anti-aircraft. AA – AEGIS ashore. AAA – Anti-aircraft artillery "Triple A". AAAV – Advanced Amphibious Assault Vehicle. AAC – Army Acquisition Corps. AAD – Armored amphibious dozer. AADC – Area air defense commander. AAE – Army acquisition executive.
The Heckler & Koch G3 ( German: Gewehr 3) is a select-fire battle rifle chambered in 7.62×51mm NATO developed in the 1950s by the German firearms manufacturer Heckler & Koch, in collaboration with the Spanish state-owned firearms manufacturer CETME. [ 2] The G3 was the service rifle of the German Bundeswehr until it was replaced by the Heckler ...
The HJ-12 is a modern, third generation anti-tank missile developed by Norinco. The HJ-12 is a fire-and-forget system utilising lock-on before launch (LOBL) and is capable of being fired within buildings and bunkers due to its soft launch system. Once launched, it will home autonomously onto its target, allowing the operator to immediately take ...
An electromagnetic door holder ( electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release. A fire alarm control panel or a similar emergency ...
Lockout–tagout. Lockout Tagout hasp can accommodate up to 6 padlocks, can be used during group LOTO procedure. Lock out, tag out or lockout–tagout ( LOTO) is a safety procedure used to ensure that dangerous equipment is properly shut off and not able to be started up again prior to the completion of maintenance or repair work.
Locked breech. Locked breech is the design of a breech-reloading firearm's action. This is important in understanding how a self-reloading firearm works. In the simplest terms, the locked breech is one way to slow down the opening of the breech of a self-reloading firearm when fired. The source of power for the movement is recoil .