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 6145-00-921-4520
NSN 6145-01-534-7170
NSN 6130-01-207-7148
NSN 2925-01-503-6792
NSN 5960-00-197-6282
NSN 6135-00-927-5848
NSN 5895-00-752-6171
NSN 5985-00-952-6626
NSN 5855-00-149-0766
NSN 5950-00-147-7196
NSN 5905-01-062-0805
NSN 6150-00-855-4227