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 5920-00-778-3882
NSN 5996-00-681-8223
NSN 7035-01-081-5797
NSN 5990-00-476-4336
NSN 5945-01-546-8933
NSN 6620-00-342-0751
NSN 5920-01-183-7938
NSN 6135-00-985-7846
NSN 5920-00-593-6496
NSN 6320-01-285-1922
NSN 5960-00-538-6872
NSN 6320-01-082-2970