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 5960-00-242-6053
NSN 6645-01-159-5173
NSN 5965-01-200-6613
NSN 5985-01-360-5617
NSN 5855-01-100-3272
NSN 5905-00-829-5230
NSN 6135-00-995-1089
NSN 5895-01-493-3459
NSN 5996-01-495-0763
NSN 5935-01-424-8641
NSN 5965-00-347-0231
NSN 5996-01-573-7953