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 5950-01-492-5919
NSN 5930-01-211-7779
NSN 5990-00-343-4465
NSN 6685-00-296-0392
NSN 5975-00-553-7151
NSN 5996-01-398-4755
NSN 5925-01-194-5532
NSN 6650-01-164-3503
NSN 4140-01-618-4840
NSN 6650-01-399-5430
NSN 5930-01-503-7889
NSN 6220-01-434-4306