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 5855-01-228-0942
NSN 5910-00-900-6054
NSN 6240-01-212-3529
NSN 6620-00-149-7557
NSN 6145-01-021-7811
NSN 5855-01-218-1646
NSN 6150-01-053-1291
NSN 6620-01-032-3937
NSN 4140-01-423-1647
NSN 4140-00-306-0886
NSN 6145-01-513-6352
NSN 5895-00-403-1040