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 5960-01-085-4231
NSN 6105-00-798-4110
NSN 5935-00-379-4756
NSN 6320-01-592-4567
NSN 6110-00-598-2574
NSN 6220-00-760-1018
NSN 4140-01-373-1788
NSN 5996-00-598-4839
NSN 5975-00-808-5929
NSN 6685-01-454-6520
NSN 6220-01-257-1075
NSN 6105-01-285-5171