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 6650-01-510-4778
NSN 6150-01-228-0184
NSN 6105-00-878-6894
NSN 5920-01-647-8618
NSN 6105-01-415-5973
NSN 5935-01-496-3205
NSN 5999-01-516-2661
NSN 2925-01-190-3121
NSN 5960-00-331-7365
NSN 5985-00-846-9028
NSN 6650-01-207-0829
NSN 5835-01-604-6337