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 5835-01-392-7683
NSN 6135-00-191-6444
NSN 5996-01-333-0570
NSN 5895-01-318-9487
NSN 5998-00-127-3358
NSN 5960-01-389-4055
NSN 2925-01-384-4139
NSN 5835-01-185-1102
NSN 2925-01-468-7073
NSN 6105-01-445-6130
NSN 5905-01-627-3467
NSN 5930-01-494-8788