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 6320-00-116-3658
NSN 5945-01-280-9254
NSN 6610-01-167-1771
NSN 5945-01-386-1164
NSN 6130-01-496-8367
NSN 2925-01-437-1128
NSN 6240-00-340-6977
NSN 5930-01-522-1453
NSN 5996-00-428-3929
NSN 5965-01-431-5809
NSN 6145-01-518-1945
NSN 7035-01-408-8698