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 6130-00-212-4883
NSN 5960-01-266-7564
NSN 2925-00-881-3770
NSN 5975-01-534-7007
NSN 5990-01-261-2962
NSN 6145-01-094-6822
NSN 6220-01-643-3882
NSN 6150-00-127-0041
NSN 5930-01-118-5782
NSN 6145-00-493-4073
NSN 6620-01-601-4314
NSN 6220-00-404-8004