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 5935-00-865-6180
NSN 5999-00-204-9998
NSN 5998-01-348-5751
NSN 6620-00-556-1976
NSN 5950-00-819-2966
NSN 5915-01-518-5874
NSN 5910-01-566-5423
NSN 5999-01-380-9237
NSN 5996-01-548-3788
NSN 6645-01-445-5235
NSN 5915-00-261-9970
NSN 5910-01-512-1978