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 6130-01-037-2664
NSN 2925-00-708-4332
NSN 6110-00-323-9816
NSN 5975-01-467-2045
NSN 5975-00-611-0421
NSN 6685-00-888-3303
NSN 5930-01-605-3928
NSN 6150-00-003-9733
NSN 5999-01-537-8974
NSN 4140-01-352-2924
NSN 5855-01-493-6639
NSN 5930-01-519-5132