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 5835-01-487-3042
NSN 6150-01-143-1085
NSN 5985-00-018-1049
NSN 5930-00-597-1475
NSN 6130-00-173-6062
NSN 5985-01-449-1679
NSN 6685-00-230-4267
NSN 4140-01-440-8645
NSN 6685-00-016-0238
NSN 5905-01-244-1034
NSN 5950-01-117-1591
NSN 5935-01-256-2580