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 5930-00-839-6081
NSN 5855-01-407-2300
NSN 6645-00-829-8868
NSN 5960-01-211-2089
NSN 6130-01-299-1185
NSN 5990-00-770-6975
NSN 6645-01-426-8621
NSN 5835-01-143-9143
NSN 7035-00-476-7178
NSN 6105-01-383-3344
NSN 6320-01-207-0636
NSN 6150-01-280-4369