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2. Blackout (wartime) - Wikipedia

   en.wikipedia.org/wiki/Blackout_(wartime)

   A blackout curtain used in Auckland, New Zealand during World War II. Lights can simply be turned off or light can sometimes be minimized by tarring the windows of large public structures. In World War II, a dark blackout curtain was used to keep the light inside. Tarring the windows can mean a semi-permanent blackout status.

3. Blackout (fabric) - Wikipedia

   en.wikipedia.org/wiki/Blackout_(fabric)

   The process of manufacturing blackout was invented by Baltimore-based Rockland Industries, [2] and involves coating a fabric with layers of foam, or 'passes'. A '2-pass' blackout is produced by applying two passes of foam to a fabric – first, a black layer is applied to the fabric, then a white or light-colored layer is applied on top of the black.

4. Front curtain - Wikipedia

   en.wikipedia.org/wiki/Front_curtain

   The Austrian curtain or drape, also called a puff curtain, has multiple vertical lines (typically nylon) spaced evenly across the width of the fabric, which typically is a thin satin, charmeuse, or chiffon material that bunches well. Each line runs through a pulley at the top of the curtain and then horizontally to a common head block.

5. Gordon Cummins - Wikipedia

   en.wikipedia.org/wiki/Gordon_Cummins

   Gordon Frederick Cummins (18 February 1914 – 25 June 1942) was a British serial killer known as the Blackout Killer, the Blackout Ripper and the Wartime Ripper, who murdered four women and attempted to murder two others over a six-day period in London in February 1942.

6. Greyout - Wikipedia

   en.wikipedia.org/wiki/Greyout

   A greyout can be readily reversed by lying down as the cardiovascular system does not need to work against gravity for blood to reach the brain. A greyout may be experienced by aircraft pilots pulling high positive g-forces as when pulling up into a loop or a tight turn, which forces blood to the lower extremities of the body and lowers blood ...

7. Air door - Wikipedia

   en.wikipedia.org/wiki/Air_door

   A typical commercial air curtain enclosure. In North America, the more commonly-used term for an air door is "air curtain". The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines an air door as follows: "In its simplest application, an air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space.