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 5985-00-503-0137
NSN 5990-01-247-8277
NSN 4140-01-447-4342
NSN 5855-00-237-4088
NSN 5945-01-521-4254
NSN 7035-00-803-3056
NSN 5945-00-415-1789
NSN 6620-01-327-3011
NSN 5965-01-127-0389
NSN 6105-00-222-4611
NSN 6320-00-593-0379
NSN 5920-00-584-4592