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 5965-00-161-4578
NSN 5930-01-643-3356
NSN 5935-00-842-7255
NSN 5975-01-244-0942
NSN 5835-01-431-2178
NSN 5910-01-514-0094
NSN 5999-01-385-6712
NSN 6130-01-574-3674
NSN 5990-01-343-6407
NSN 5945-00-562-8184
NSN 6240-00-879-5830
NSN 5935-00-153-4365