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 6110-01-035-0347
NSN 5910-01-384-2628
NSN 5895-01-320-3870
NSN 6320-01-624-0193
NSN 6650-00-009-1427
NSN 4140-00-809-8996
NSN 5935-00-740-8759
NSN 5945-01-149-4291
NSN 5895-01-079-1739
NSN 5930-01-360-5094
NSN 5930-01-612-1590
NSN 5855-00-361-0167