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  2. Insulated glazing - Wikipedia

    en.wikipedia.org/wiki/Insulated_glazing

    A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]

  3. Traveler curtain - Wikipedia

    en.wikipedia.org/wiki/Traveler_curtain

    A traveler curtain, also called draw curtain, bi-parting curtain, or just traveler, is the most common type of front curtain used in theaters. Traveler curtains remain at a fixed elevation and open and close horizontally, break up and meet in the middle, and consequently require a minimum of fly space .

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