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 6105-01-373-4343
NSN 5905-01-552-8271
NSN 5945-01-152-1932
NSN 5925-00-830-8148
NSN 6620-01-420-1735
NSN 5920-01-018-4152
NSN 5930-01-586-3328
NSN 5945-00-263-1511
NSN 2925-01-524-6622
NSN 5915-00-420-6772
NSN 5905-01-410-8694
NSN 6220-01-414-0623