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 6150-00-081-2063
NSN 5910-00-133-2952
NSN 6145-00-959-5897
NSN 5965-01-091-1884
NSN 6105-01-652-2299
NSN 6620-01-428-7072
NSN 6220-00-923-9439
NSN 5960-01-340-4487
NSN 2925-01-543-0073
NSN 5895-01-534-7189
NSN 6110-01-111-8762
NSN 6610-01-112-2924