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 5999-00-206-0444
NSN 5996-00-827-2094
NSN 5975-00-149-0758
NSN 6320-01-388-3125
NSN 5915-01-116-4507
NSN 5998-01-555-8924
NSN 5915-00-244-1702
NSN 6105-01-567-4454
NSN 6240-01-559-9117
NSN 5930-01-196-6137
NSN 5855-00-110-9341
NSN 5985-01-382-9220