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 6110-00-422-4973
NSN 6610-00-151-8074
NSN 6220-01-051-3865
NSN 5910-01-510-9454
NSN 5925-01-018-4544
NSN 6240-01-558-4104
NSN 5975-01-506-5001
NSN 6650-00-826-7396
NSN 5950-00-624-8849
NSN 2925-00-835-4315
NSN 5999-01-486-7731
NSN 5910-01-392-4064