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 6130-00-405-0402
NSN 6610-00-277-7206
NSN 6130-00-235-6936
NSN 5935-00-336-3141
NSN 6110-01-046-0120
NSN 6610-01-048-0684
NSN 5945-01-500-5370
NSN 5930-01-133-3351
NSN 4140-01-648-3371
NSN 5945-01-293-1030
NSN 6620-01-600-0479
NSN 6645-00-809-3540