A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5910-00-647-1158
NSN 6220-01-087-3811
NSN 5915-00-617-9477
NSN 5920-01-512-9132
NSN 5935-01-542-5591
NSN 2925-00-150-7334
NSN 5925-01-107-1951
NSN 6145-01-582-0585
NSN 5945-01-395-6594
NSN 2925-01-580-8072
NSN 5930-01-646-0045
NSN 5855-01-218-3735