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 6685-01-316-5631
NSN 6240-01-212-9756
NSN 5950-01-399-8677
NSN 5920-01-337-5488
NSN 5950-00-721-3613
NSN 6650-01-228-5094
NSN 6110-01-490-0246
NSN 6150-01-468-5675
NSN 5950-01-144-3236
NSN 2925-00-398-0253
NSN 5935-00-834-7715
NSN 6110-00-816-7444