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 6130-00-451-3113
NSN 5905-01-476-0569
NSN 4140-01-555-9876
NSN 6135-01-022-5427
NSN 5920-00-106-5751
NSN 5996-00-577-0483
NSN 5895-01-481-4606
NSN 6240-01-531-1684
NSN 5930-00-707-5696
NSN 6685-01-568-7234
NSN 5960-01-614-0489
NSN 5996-01-446-5097