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 6620-01-371-1655
NSN 6145-01-343-9854
NSN 5895-00-853-6467
NSN 5945-01-450-9278
NSN 5975-01-176-5620
NSN 6685-00-700-4817
NSN 6110-00-188-9874
NSN 7035-01-131-1168
NSN 6220-01-337-1639
NSN 6620-01-352-5640
NSN 6220-00-487-0403
NSN 5990-00-394-3987