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 5985-01-227-8425
NSN 5990-00-855-6535
NSN 5915-01-091-5808
NSN 6105-01-629-6481
NSN 6220-01-298-1076
NSN 5950-01-211-7018
NSN 5910-01-381-7807
NSN 5990-01-193-0487
NSN 6645-01-211-6502
NSN 6645-01-400-1137
NSN 6620-01-143-4862
NSN 5950-00-486-9504