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 5990-01-386-5561
NSN 6105-01-490-1009
NSN 5920-01-490-0610
NSN 5920-01-064-0503
NSN 5905-01-553-8696
NSN 6685-01-373-7901
NSN 6130-01-551-7991
NSN 5990-01-044-4767
NSN 5855-00-688-9954
NSN 5925-01-295-0612
NSN 6610-01-383-7419
NSN 6105-01-634-0322