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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. Exit control lock - Wikipedia

    en.wikipedia.org/wiki/Exit_control_lock

    This delay reserves time for security personnel to get to the door before the door opens. The lock will also release if there is a fire alarm or power failure, but otherwise these locks hold the exit doors shut. Exit control systems can include a "request to exit detector" such as a pushbutton that opens the exit, if exit requests are enabled.

  4. List of companies based in Tulsa, Oklahoma - Wikipedia

    en.wikipedia.org/wiki/List_of_companies_based_in...

    The city was ranked as being the 26th greenest in the country. [9] [10] [11] MetroMonitor ranked Tulsa 35th in the nation for economic recovery. [12] It was listed as 6th best city for small business and jobs by the Business Journal and Forbes in 2008. [13] In 2012, Tulsa was ranked second for young people to find a job by the Fiscal Times. [14]

  5. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    Wall-mounted electromagnetic door holder securing a door in the open position. 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.

  6. Tulsa, Oklahoma - Wikipedia

    en.wikipedia.org/wiki/Tulsa,_Oklahoma

    The Tulsa City-County Library and the University of Tulsa's Law Library are also federal depository libraries, making Tulsa the only city in Oklahoma with more than two federal depository libraries. [172] The Tulsa City County Library's Downtown branch was massively renovated and opened to the public on Saturday, October 1, 2016.

  7. List of companies based in Oklahoma City - Wikipedia

    en.wikipedia.org/wiki/List_of_companies_based_in...

    Major companies based in Oklahoma City. Expand Energy - Fortune 500 (163) Continental Resources (NYSE) Devon Energy - Fortune 500 (270) and NYSE [1]

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