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 5990-00-469-2604
NSN 5998-01-022-5324
NSN 4140-00-404-1016
NSN 6220-01-548-2198
NSN 6105-00-588-2470
NSN 5985-01-170-4076
NSN 5960-01-215-0992
NSN 5945-00-419-0184
NSN 6135-01-222-0703
NSN 6110-01-024-7141
NSN 5999-01-462-7849
NSN 5930-00-949-0130