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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.
This is exactly the same principle as a child safety door lock which is installed on car doors. Electric strikes on AC may allow someone outside the door to hear when the door is unlocked. A buzzing noise is typically made by applying alternating current (AC) to the strike instead of direct current (DC). When using a DC powered strike, the ...
Door closers that are mounted in the floor directly under the pivot point beneath a decor plate are referred to as floor springs and come in two variations, single action for doors opening one way (right and left hand) and double action for doors that open inward and outward, both types can either be none hold open (NHO) or hold open (HO).
The second and most well known option is the 19-tube tube-bundle flow conditioner. The majority of flow installations in North America contain the tube bundle. With the help of hot wire, pitot tube and laser -based computerized measurement systems which allow detailed measurement of velocity profile and turbulence intensity; we know that the ...
The traditional centres of hand textile production such as India, parts of the Middle East, and later China could not withstand the competition from machine-made textiles, which over a period of decades destroyed the hand-made textile industries and left millions of people without work, many of whom starved.
A straightening iron, a kind of hair iron; Any substance used in hair straightening; A shaft straightener, a device used in making an arrow or spear; Flow straightener, a key element of a wind tunnel; Straightener (metalworking), a device used in metalworking to straighten material before it is fed to a stamping press