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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.
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.
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]
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.
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.
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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