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 5996-01-026-8382
NSN 6685-00-889-5103
NSN 6685-01-121-6892
NSN 5985-00-374-1062
NSN 5985-01-236-4471
NSN 5996-01-351-6181
NSN 6685-01-304-8054
NSN 5998-01-469-9209
NSN 4140-01-544-9807
NSN 5835-01-416-6455
NSN 5855-01-630-7666
NSN 5910-01-331-9687