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 5930-00-853-5936
NSN 5960-00-419-3641
NSN 5975-00-926-3073
NSN 5985-01-196-6144
NSN 5975-00-232-4132
NSN 6150-01-195-0993
NSN 6135-01-265-1384
NSN 5855-01-339-7675
NSN 5920-01-303-5951
NSN 5960-01-291-3075
NSN 5985-00-224-5249
NSN 6130-01-367-5649