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 5960-01-399-4327
NSN 5920-01-645-8052
NSN 5915-01-361-9136
NSN 5895-01-467-3834
NSN 5910-01-398-6867
NSN 5895-00-097-8948
NSN 6150-01-052-9339
NSN 5950-01-434-3521
NSN 6110-00-337-0858
NSN 6685-01-523-6889
NSN 6685-00-462-1009
NSN 5975-01-489-5361