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 6135-01-444-6824
NSN 5835-00-729-9305
NSN 7035-00-703-3535
NSN 5985-01-182-7437
NSN 5999-01-274-3041
NSN 5855-00-631-4565
NSN 5925-01-352-3349
NSN 5925-00-508-3644
NSN 4140-00-501-7833
NSN 5895-01-045-4442
NSN 5905-00-526-0753
NSN 5999-00-153-4175