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  2. Interlocking - Wikipedia

    en.wikipedia.org/wiki/Interlocking

    A view of the locking bed inside Deval Tower, Des Plaines, Illinois. In mechanical interlocking plants, a locking bed is constructed, consisting of steel bars forming a grid. The levers that operate switches, derails, signals or other appliances are connected to the bars running in one direction.

  3. Interlock (engineering) - Wikipedia

    en.wikipedia.org/wiki/Interlock_(engineering)

    Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.

  4. Mattress protector - Wikipedia

    en.wikipedia.org/wiki/Mattress_protector

    Mattress protectors must be left on for at least a full year to make sure that the trapped bed bugs and their eggs die. [citation needed] If the cover is taken off early, the bed bug infestation may relapse. Waterproof mattress protectors also reduce allergy symptoms by reducing the ability of mold to grow in a mattress.

  5. Protect your bed with these mattress protectors - AOL

    www.aol.com/news/protect-bed-mattress-protectors...

    This protector fully surrounds your mattress and zips shut, a feature that can help protect it from bed bugs, says Meek. It has a 4.6-star average from over 17,700 reviews on Amazon. In addition ...

  6. Lever frame - Wikipedia

    en.wikipedia.org/wiki/Lever_frame

    A mechanical lever frame inside the signal box at Knockcroghery in Ireland Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907). Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks [1] and points to allow the safe operation of trains in the area the signals control.

  7. Trapped-key interlocking - Wikipedia

    en.wikipedia.org/wiki/Trapped-key_interlocking

    This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks ...

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