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 5985-00-051-3118
NSN 5990-01-538-4880
NSN 6135-01-304-6423
NSN 6620-01-256-4307
NSN 5835-00-170-5238
NSN 6320-01-211-6578
NSN 6130-01-227-2115
NSN 6610-01-255-1433
NSN 6110-00-816-9715
NSN 5945-00-927-2925
NSN 6130-01-377-0370
NSN 5998-00-158-3192