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 6610-01-301-3513
NSN 5990-01-421-5342
NSN 5999-01-648-2640
NSN 4140-00-012-3506
NSN 5855-00-586-6255
NSN 5920-01-249-7616
NSN 5945-00-924-5557
NSN 6135-01-268-7056
NSN 5935-01-456-2425
NSN 6620-01-568-5226
NSN 6685-01-575-2163
NSN 5985-01-269-1260