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 6110-01-393-7645
NSN 6135-00-885-6003
NSN 6685-01-363-0516
NSN 5930-00-135-3230
NSN 6105-01-268-9667
NSN 6130-01-094-5599
NSN 6610-01-069-1156
NSN 5998-01-469-2145
NSN 5920-00-752-3081
NSN 6645-00-547-4388
NSN 5996-00-693-9568
NSN 5950-01-334-2870