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 5895-01-271-3500
NSN 6135-01-333-6101
NSN 6135-01-499-6293
NSN 5999-01-422-2556
NSN 6150-01-219-7369
NSN 6220-01-409-1585
NSN 4140-01-460-4774
NSN 6645-01-180-6219
NSN 6685-00-676-6320
NSN 6150-01-617-5900
NSN 6130-00-682-3350
NSN 6685-01-608-3733