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 5910-00-125-8779
NSN 5945-01-089-5803
NSN 5920-01-542-6822
NSN 6130-01-247-9135
NSN 5910-00-869-6378
NSN 5960-01-112-0721
NSN 6105-01-429-6853
NSN 5990-01-231-9608
NSN 5985-01-248-1725
NSN 5950-00-008-0951
NSN 5975-01-352-7829
NSN 5950-00-067-6497