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 5999-01-469-1066
NSN 5985-01-046-4006
NSN 5905-01-542-2133
NSN 5965-01-357-8259
NSN 6150-01-506-9685
NSN 5990-01-574-2522
NSN 5998-01-451-7357
NSN 5895-01-464-4591
NSN 5998-00-125-6383
NSN 6320-00-676-9387
NSN 6620-01-601-4314
NSN 5950-00-424-3791