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 5985-00-689-1974
NSN 5905-01-634-0595
NSN 5985-01-659-8765
NSN 5925-00-617-2994
NSN 6645-00-041-4074
NSN 6110-01-210-9183
NSN 5990-00-801-7923
NSN 5930-01-517-1256
NSN 5895-01-351-0199
NSN 6320-00-731-6134
NSN 6135-01-226-4071
NSN 6150-01-456-2809