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 5960-00-236-3980
NSN 6130-01-576-9618
NSN 5960-01-469-2006
NSN 6685-01-065-8722
NSN 5985-00-492-7921
NSN 5998-01-383-5939
NSN 6620-00-186-8220
NSN 5965-01-215-0993
NSN 5910-01-323-7086
NSN 6610-00-650-4328
NSN 6650-01-173-5651
NSN 5930-01-285-3514