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 5998-01-049-0359
NSN 6220-01-364-7808
NSN 6135-01-411-3212
NSN 6150-01-278-4181
NSN 5935-01-660-4149
NSN 6620-01-235-7992
NSN 5965-01-104-0947
NSN 5835-01-219-0586
NSN 5990-00-552-9365
NSN 5965-01-313-1253
NSN 5996-00-294-7045
NSN 5996-01-648-0405