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 5999-00-189-0032
NSN 5999-01-356-1294
NSN 5925-01-224-0285
NSN 5945-01-436-2861
NSN 7035-01-597-1449
NSN 5855-01-364-9810
NSN 6135-00-643-4843
NSN 5945-01-081-5013
NSN 5930-00-528-9728
NSN 5985-01-082-3265
NSN 6145-01-250-6825
NSN 5855-00-058-1293