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  2. Crash bar - Wikipedia

    en.wikipedia.org/wiki/Crash_bar

    Crash bar doors in a school, with upper vertical rod latches. 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.

  3. Flexible glass - Wikipedia

    en.wikipedia.org/wiki/Flexible_glass

    Flexible glass is an alleged lost invention from the time of the reign of Tiberius Caesar. The story is often doubted. [1] Mythology

  4. Styrene-butadiene - Wikipedia

    en.wikipedia.org/wiki/Styrene-butadiene

    Styrene-butadiene or styrene-butadiene rubber (SBR) describe families of synthetic rubbers derived from styrene and butadiene (the version developed by Goodyear is called Neolite [1]). These materials have good abrasion resistance and good aging stability when protected by additives.

  5. Sliding door - Wikipedia

    en.wikipedia.org/wiki/Sliding_door

    A groove is cut into the bottom of the door which runs over this guide, preventing lateral movement of the door. With a glass door, the panel runs through the guide as illustrated. Because the door is always engaged in the guide, when the door is open, the floor is clear; hence 'clear threshold'. The bottom of the doors are held in place on tracks.

  6. Seismic analysis - Wikipedia

    en.wikipedia.org/wiki/Seismic_analysis

    First and second modes of building seismic response. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building (or nonbuilding) structure to earthquakes.

  7. Glossary of rail transport terms - Wikipedia

    en.wikipedia.org/wiki/Underbody

    Panes of glass used for windows. They are either plate or rolled glass, made by pouring the molten glass onto a table having the height of the desired thickness of the plate, and then passing a roller over the top; or blown, or common window glass, the latter being by far the cheapest and most widely used, but of very much inferior quality.

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