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 6145-01-176-8195
NSN 5925-01-634-0664
NSN 4140-01-113-7611
NSN 5925-00-328-3885
NSN 6240-01-171-6452
NSN 5965-00-066-7229
NSN 5895-01-459-7170
NSN 6610-01-367-1640
NSN 6685-01-309-2308
NSN 6685-01-502-9028
NSN 5855-00-586-6255
NSN 6150-00-339-2965