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 5905-01-487-6048
NSN 5930-01-146-6625
NSN 6650-00-052-3202
NSN 5945-01-461-1749
NSN 5999-00-683-6660
NSN 6130-00-373-1757
NSN 5835-01-386-4027
NSN 4140-01-369-2959
NSN 6610-01-459-8722
NSN 5925-01-146-5528
NSN 5945-01-006-4472
NSN 5965-00-424-9636