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 5935-01-546-1062
NSN 6145-01-514-7305
NSN 5996-01-008-8838
NSN 5996-01-255-3281
NSN 6650-01-271-2960
NSN 2925-00-127-7828
NSN 5855-01-522-5457
NSN 6150-01-110-6588
NSN 7035-01-145-5059
NSN 5930-01-237-3606
NSN 5999-00-102-0352
NSN 5935-01-247-3864