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 5905-01-595-6989
NSN 5950-01-551-6253
NSN 7035-01-065-7706
NSN 6620-01-378-4108
NSN 6685-01-583-4414
NSN 5925-01-371-4506
NSN 6105-00-949-0012
NSN 5855-01-574-1821
NSN 6320-00-456-2092
NSN 6110-01-088-7198
NSN 5915-01-100-3241
NSN 4140-00-305-1023