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 5910-01-052-1869
NSN 5905-01-500-3577
NSN 5925-01-121-0401
NSN 5910-01-362-0722
NSN 6645-01-004-0803
NSN 5945-00-233-7426
NSN 6685-01-170-6576
NSN 5985-01-285-4719
NSN 5998-00-918-4774
NSN 4140-01-063-8709
NSN 4140-01-348-9029
NSN 5965-00-458-7321