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 6145-01-512-2903
NSN 5855-01-479-3152
NSN 6240-01-463-2997
NSN 5975-01-418-1858
NSN 5920-01-355-7473
NSN 6620-00-365-5454
NSN 6620-01-633-8443
NSN 5999-00-917-7688
NSN 6135-01-423-7502
NSN 6240-00-820-1705
NSN 5910-01-133-3138
NSN 5925-00-769-6869