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Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.
A carbon filament lamp using chlorine to prevent darkening of the envelope was patented [2] by Edward Scribner of the US Electric Lighting Co. in 1882, and chlorine-filled "NoVak" lamps were marketed in 1892.