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 5930-01-294-0811
NSN 6685-01-424-1542
NSN 5960-01-499-7172
NSN 5925-00-529-0441
NSN 5999-01-024-9547
NSN 5965-01-573-7359
NSN 5965-00-035-4556
NSN 5998-00-182-1421
NSN 6145-00-916-7217
NSN 5960-00-726-0580
NSN 6110-00-921-8277
NSN 5835-01-576-9013