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 5910-01-190-8421
NSN 6620-01-304-0944
NSN 7035-00-973-9215
NSN 6645-01-649-8227
NSN 6110-01-180-5097
NSN 5965-00-665-2156
NSN 6105-01-443-9547
NSN 5920-01-334-9848
NSN 6610-01-258-7059
NSN 5895-01-297-8000
NSN 6130-00-287-2932
NSN 5950-01-485-3147