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 5945-01-603-2737
NSN 5895-01-452-6232
NSN 5999-01-643-6736
NSN 5990-01-595-9441
NSN 5910-01-104-5531
NSN 6240-01-396-3109
NSN 5915-00-197-7077
NSN 2925-01-335-4549
NSN 6105-01-325-8307
NSN 5996-00-175-0462
NSN 5998-01-492-2731
NSN 5945-00-618-4761