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  2. Windowed envelope - Wikipedia

    en.wikipedia.org/wiki/Windowed_envelope

    Windowed envelope. US Patent 701,839 for a windowed envelope. Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.

  3. X-ray tube - Wikipedia

    en.wikipedia.org/wiki/X-ray_tube

    Centre is the anode which is made from tungsten and embedded in the copper sleeve. William Coolidge explains medical imaging and X-rays. An X-ray tube is a vacuum tube that converts electrical input power into X-rays. [ 1 ] The availability of this controllable source of X-rays created the field of radiography, the imaging of partly opaque ...

  4. Envelope - Wikipedia

    en.wikipedia.org/wiki/Envelope

    An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

  5. Glassine - Wikipedia

    en.wikipedia.org/wiki/Glassine

    Glassine. Printed glassine envelope for the photographer Arthur Weston, c. 1900. Glassine envelope. Glassine is a smooth and glossy paper that is air-, water-, and grease-resistant. It is usually available in densities between 50–90 g/m 2 (0.010–0.018 lb/sq ft). It is translucent unless dyes are added to color it or make it opaque.

  6. Weatherstripping - Wikipedia

    en.wikipedia.org/wiki/Weatherstripping

    Weatherstripping is the process of sealing openings such as doors, windows, and trunks from the waters above. The term can also refer to the materials used to carry out such sealing processes. The goal of weatherstripping is to prevent rain and water from entering entirely or partially and accomplishes this by either returning or rerouting water.

  7. Thermal bridge - Wikipedia

    en.wikipedia.org/wiki/Thermal_bridge

    Thermal bridge. A thermal bridge, also called a cold bridge, heat bridge, or thermal bypass, is an area or component of an object which has higher thermal conductivity than the surrounding materials, [1] creating a path of least resistance for heat transfer. [2] Thermal bridges result in an overall reduction in thermal resistance of the object.

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