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 6135-01-503-1688
NSN 6650-00-943-4247
NSN 5895-01-145-5204
NSN 5920-00-468-3074
NSN 6150-01-359-8183
NSN 6610-01-095-1459
NSN 5920-00-435-5999
NSN 5990-01-432-4984
NSN 6645-01-514-5841
NSN 5999-01-387-0160
NSN 6320-01-600-0787
NSN 5835-01-360-2657