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 5855-01-424-2769
NSN 6620-00-113-4530
NSN 6620-01-010-7337
NSN 5925-01-232-0450
NSN 4140-01-152-9161
NSN 5999-01-458-7331
NSN 5905-00-036-6179
NSN 5915-00-290-1569
NSN 5965-01-261-5364
NSN 5855-00-451-6155
NSN 5999-00-925-9535
NSN 5930-00-171-8867