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 5945-01-508-7882
NSN 5998-00-695-4920
NSN 5985-00-089-0531
NSN 6610-01-236-8359
NSN 5965-00-959-4910
NSN 6650-00-193-7358
NSN 5996-01-190-9982
NSN 5985-00-009-4328
NSN 5910-01-514-6223
NSN 6240-01-219-4276
NSN 6650-00-740-7338
NSN 7035-01-608-5570