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 6110-00-763-1079
NSN 6620-00-916-3134
NSN 6130-01-532-0567
NSN 5930-01-513-3582
NSN 6240-01-052-4248
NSN 5965-01-438-8249
NSN 5855-00-405-4532
NSN 5999-00-419-0244
NSN 5990-01-332-3623
NSN 2925-01-076-6128
NSN 6650-00-450-9893
NSN 6645-01-503-8211