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 6110-01-372-1314
NSN 5935-01-523-5931
NSN 4140-01-617-2432
NSN 6620-01-590-7035
NSN 6610-01-205-4589
NSN
NSN 5910-01-464-5499
NSN 5930-00-872-1671
NSN 2925-01-099-7075
NSN 6650-00-197-7563
NSN 5855-00-688-9954
NSN 6240-01-629-6174