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 5895-01-442-4102
NSN 5985-01-521-0938
NSN 6685-01-411-5969
NSN 6620-00-246-6448
NSN 6220-01-543-7937
NSN 5998-00-445-6115
NSN 5930-01-398-2778
NSN 6135-01-329-7994
NSN 6240-01-633-9357
NSN 5965-00-104-3121
NSN 6645-01-078-4887
NSN 5935-01-524-2809