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 5835-00-378-1429
NSN 5925-00-943-4489
NSN 7035-00-215-3272
NSN 5855-01-270-6847
NSN 6150-00-901-7264
NSN 6110-01-065-2853
NSN 5930-01-373-8258
NSN 5910-00-834-1840
NSN 6105-01-322-6769
NSN 5835-01-632-6627
NSN 6610-00-085-4436
NSN 5910-01-052-6894