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 6240-00-052-0786
NSN 5855-01-433-7009
NSN 2925-00-284-1534
NSN 5965-01-429-0881
NSN 5950-01-012-1652
NSN 2925-00-714-3932
NSN 4140-01-466-5147
NSN 6320-01-415-0953
NSN 5905-00-276-8597
NSN 4140-01-464-8902
NSN 6610-01-398-1094
NSN 7035-01-630-8371