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 5975-01-442-4493
NSN 5935-01-034-6467
NSN 5998-01-577-1914
NSN 5935-01-555-6687
NSN 4140-01-144-0387
NSN 5999-01-442-0653
NSN 6650-00-105-1418
NSN 6145-01-413-4573
NSN 6240-01-424-0746
NSN 6620-01-654-7142
NSN 6135-00-221-4720
NSN 2925-01-291-9997