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 5960-00-232-2512
NSN 2925-01-359-4027
NSN 6105-00-795-4071
NSN 6130-01-306-6449
NSN 6645-01-432-1068
NSN 6135-01-646-3039
NSN 5945-01-406-0704
NSN 5910-00-400-5952
NSN 5999-01-528-5330
NSN 6320-00-343-1798
NSN 5990-01-246-2488
NSN 5999-00-156-4424