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 6320-00-553-8427
NSN 5930-00-708-1499
NSN 5920-01-306-0110
NSN 5905-00-554-4325
NSN 6110-01-057-0806
NSN 7035-00-513-9764
NSN 6110-01-216-7173
NSN 6240-01-437-6888
NSN 5975-01-485-3470
NSN 5905-01-216-8527
NSN 5895-00-933-1475
NSN 6320-00-186-6452