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 5999-00-924-5603
NSN 5950-01-050-7742
NSN 4140-01-442-1670
NSN 5985-00-729-8180
NSN 6610-01-382-1936
NSN 5935-00-824-1809
NSN 5990-01-272-4091
NSN 6105-01-597-3447
NSN 6105-00-911-6611
NSN 5990-00-382-5885
NSN 5935-00-170-4261
NSN 6685-01-474-2254