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 6135-01-061-1862
NSN 5985-01-425-4133
NSN 6130-00-177-6466
NSN 2925-01-191-9668
NSN 6650-00-098-6128
NSN 6105-01-069-4253
NSN 6645-00-085-7603
NSN 5975-01-470-7464
NSN 7035-00-703-3535
NSN 5985-00-385-1643
NSN 6685-01-350-3451
NSN 5905-01-345-1417