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 5910-00-999-2414
NSN 4140-01-565-8487
NSN 5835-01-575-5053
NSN 5910-01-282-9500
NSN 6135-01-020-3805
NSN 5975-00-225-5293
NSN 6150-01-172-4109
NSN 5975-01-411-4728
NSN 5950-00-703-1686
NSN 5945-01-141-9314
NSN 5895-01-078-5459
NSN 6110-01-380-8639