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 5999-01-387-4924
NSN 5935-01-206-4091
NSN 6110-01-483-5102
NSN 6685-01-503-9837
NSN 7035-01-165-0234
NSN 5925-00-147-9946
NSN 6685-01-512-8831
NSN 5945-01-598-1225
NSN 5996-01-439-5120
NSN 5960-00-925-2111
NSN 5945-01-014-5059
NSN 5905-01-482-6118