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 5990-00-959-2514
NSN 5905-00-534-7698
NSN 5920-01-269-8989
NSN 5996-01-432-0117
NSN 6620-01-027-6658
NSN 6150-01-563-8244
NSN 5895-01-508-5966
NSN 5920-00-818-4186
NSN 5835-00-553-3575
NSN 6105-00-503-5100
NSN 6110-00-961-1100
NSN 6610-01-010-3831