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 6145-00-408-9976
NSN 6135-01-264-1311
NSN 5920-00-179-7899
NSN 5975-01-050-7785
NSN 6240-01-627-0063
NSN 5855-00-446-5921
NSN 6685-01-382-9932
NSN 5935-01-267-6943
NSN 6135-01-297-5565
NSN 5910-00-304-7862
NSN 6685-01-146-4498
NSN 6145-01-409-1685