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 5960-01-029-4253
NSN 6130-01-178-6409
NSN 5895-00-798-5798
NSN 6320-01-631-7828
NSN 4140-01-510-3984
NSN 5960-01-617-6345
NSN 6130-00-377-0655
NSN 6645-01-032-5337
NSN 5999-00-837-9205
NSN 5945-00-962-7202
NSN 5920-01-555-3597
NSN 7035-01-568-0144