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  2. D-Day Daily Telegraph crossword security alarm - Wikipedia

    en.wikipedia.org/wiki/D-Day_Daily_Telegraph...

    As a result, war-related words including those codenames got into the crosswords; Dawe said later that at the time he did not know that these words were military codewords. On 18 August 1942, a day before the Dieppe raid , 'Dieppe' appeared as an answer in The Daily Telegraph crossword (set on 17 August 1942) (clued "French port"), causing a ...

  3. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]

  4. Clue (information) - Wikipedia

    en.wikipedia.org/wiki/Clue_(information)

    In some games, if a player is stuck on a puzzle or riddle, they can ask or pay [7] for clues to help them progress in the game. In some games, clues are an integral ludeme of the game mechanics, whereas in others they are considered cheats. Clues in games or crosswords can either be given straight, [8] be cryptic, [8] be riddles, or contain ...

  5. 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.

  6. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...

  7. Sliding door operator - Wikipedia

    en.wikipedia.org/wiki/Sliding_door_operator

    The operator is placed in the space above the sliding door. An electric motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.

  8. Door knocker - Wikipedia

    en.wikipedia.org/wiki/Door_knocker

    A door knocker is an item of door furniture that allows people outside a house or other dwelling or building to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise.

  9. Glossary of locksmithing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

    In Scottish English or Irish English, the word is sometimes used as a synonym for lock. [10] Spool pin A spool pin is a type of security pin used to prevent picking in a pin tumbler lock. The pin is shaped like a cable reel. [9] Strike plate A strike plate is a metal plate affixed to a doorjamb with a hole or holes for the bolt of the door ...

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