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 5910-00-050-6280
NSN 5935-00-233-5430
NSN 5985-01-094-6607
NSN 5895-01-408-6609
NSN 5915-01-626-0008
NSN 6610-00-314-2605
NSN 5990-00-578-8850
NSN 6220-01-378-7467
NSN 5855-01-058-6687
NSN 5935-01-555-8418
NSN 5905-01-607-1504
NSN 4140-01-130-7858