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 6135-00-437-5182
NSN 5895-01-186-4368
NSN 6620-01-573-1952
NSN 6220-01-123-4096
NSN 5985-01-562-4447
NSN 6110-01-257-1831
NSN 5925-00-829-3285
NSN 6110-01-058-2112
NSN 5950-00-810-9459
NSN 5998-01-313-2681
NSN 5965-01-180-5468
NSN 5925-01-469-6667