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 6135-01-420-0341
NSN 5990-01-626-3840
NSN 5996-01-607-7035
NSN 6650-00-166-0284
NSN 6650-01-168-8451
NSN 6220-01-615-8409
NSN 6320-01-212-8749
NSN 5925-00-399-1120
NSN 6110-00-032-2596
NSN 6645-01-450-0809
NSN 5960-00-553-7338
NSN 6240-01-659-5862