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  2. Bar gate - Wikipedia

    en.wikipedia.org/wiki/Bar_gate

    Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.

  3. Baby gate - Wikipedia

    en.wikipedia.org/wiki/Baby_gate

    In some situations, pressure gates at the top of stairs have caused serious injury when a child has run against it or when a parent has fallen trying to step over the gate. Hardware mounted gates are the most secure option and should be installed securely into wall studs. [3] Baby gates are typically removed once a child is capable of opening ...

  4. 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.

  5. Glossary of firefighting equipment - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_firefighting...

    A twenty-four inch bar with a U-shaped head, designed for grabbing and pulling lock cylinders. The other end is a chisel tip. Rig See apparatus. Ringdown (telephone) An automatic ringdown circuit consists of two phones at different locations. When either phone goes off-hook, the one at the other end instantly rings. Ringdown (radio)

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