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 5945-01-100-3654
NSN 5965-00-903-6298
NSN 5945-01-174-1128
NSN 6620-00-992-8436
NSN 5905-00-845-3857
NSN 5905-01-097-7872
NSN 5855-00-237-4088
NSN 5985-00-983-9433
NSN 5998-00-896-9619
NSN 6105-01-214-8870
NSN 6650-01-230-5155
NSN 6135-01-388-2581