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 5925-00-557-4530
NSN 5835-00-681-0005
NSN 5965-01-296-8991
NSN 5930-01-273-0152
NSN 5960-00-636-4834
NSN 6645-00-510-6643
NSN 6620-00-799-4244
NSN 6220-01-530-2267
NSN 6135-00-990-1822
NSN 5999-01-010-1466
NSN 5990-01-485-0260
NSN 6610-01-046-5669