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 5915-01-547-1911
NSN 6150-01-188-3548
NSN 5998-01-100-1116
NSN 5910-01-417-2597
NSN 5935-00-996-7617
NSN 5999-01-365-9018
NSN 2925-01-645-2948
NSN 6240-01-425-1160
NSN 5895-00-218-1355
NSN 6645-01-191-5081
NSN 6220-01-534-3965
NSN 5920-01-376-3924