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 5945-01-579-2271
NSN 5905-01-358-4301
NSN 5990-00-791-4064
NSN 6620-01-288-8249
NSN 5950-01-392-1397
NSN 6650-01-484-7095
NSN 6240-01-157-9128
NSN 6220-00-357-1933
NSN 6130-00-401-1177
NSN 5930-00-998-7599
NSN 5975-00-427-1063
NSN 6610-00-602-2008