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 5925-00-498-4084
NSN 2925-01-027-1293
NSN 5998-01-071-4573
NSN 6220-01-513-0060
NSN 5999-00-752-1044
NSN 5996-01-373-1280
NSN 6145-00-633-0780
NSN 5835-00-928-5717
NSN 6320-01-054-3046
NSN 6145-00-825-2657
NSN 6320-00-681-1324
NSN 4140-00-715-9946