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 6685-01-603-3153
NSN 7035-01-364-8454
NSN 4140-01-502-8993
NSN 6320-00-116-3658
NSN 5945-01-222-9263
NSN 5975-00-636-1988
NSN 6105-01-441-1912
NSN 5930-01-345-9631
NSN 7035-01-106-3476
NSN 6150-01-585-8869
NSN 6620-00-267-5273
NSN 7035-00-731-8729