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 5910-01-139-2058
NSN 6610-00-260-1181
NSN 5895-00-838-2649
NSN 6685-00-027-7186
NSN 5990-00-891-8817
NSN 2925-01-049-8906
NSN 7035-01-204-9851
NSN 5975-01-158-1061
NSN 6145-01-159-2016
NSN 5905-01-328-4520
NSN 6110-01-633-9660
NSN 5985-00-454-2101