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 5950-01-467-8556
NSN 6110-00-256-6614
NSN 6320-01-247-0898
NSN 5998-00-433-6845
NSN 6320-00-908-6841
NSN 5905-01-442-3168
NSN 2925-00-139-8309
NSN 5920-00-926-7560
NSN 5910-00-961-5355
NSN 6130-01-443-6655
NSN 5920-00-929-7899
NSN 4140-01-308-3932