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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5999-01-653-0482
NSN 6145-01-650-9227
NSN 5990-01-116-2181
NSN 6685-01-390-0412
NSN 4140-00-989-3257
NSN 5950-01-601-9980
NSN 5999-01-076-2758
NSN 5935-00-383-3535
NSN 5935-00-017-4710
NSN 6685-01-445-4184
NSN 6650-00-519-0973
NSN 5960-01-495-0859