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 6240-01-271-2222
NSN 6110-01-538-6218
NSN 5990-00-181-2220
NSN 5985-00-518-8658
NSN 5905-01-502-4561
NSN 5920-01-420-5768
NSN 5990-01-205-5937
NSN 6105-01-347-2615
NSN 5990-01-185-9835
NSN 5998-01-283-7064
NSN 6150-00-782-7687
NSN 6240-01-487-5182