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 6610-01-454-8386
NSN 5905-01-401-5325
NSN 5920-00-201-4914
NSN 6650-01-331-5243
NSN 2925-01-298-2674
NSN 6220-00-269-3783
NSN 6685-00-914-8393
NSN 6150-01-272-3155
NSN 6240-01-477-5323
NSN 6135-01-026-9960
NSN 6145-00-309-2211
NSN 5960-00-258-9292