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 5960-01-146-0289
NSN 5998-00-082-0368
NSN 7035-00-349-8571
NSN 5950-00-008-8685
NSN 6685-01-458-5206
NSN 5950-00-777-5525
NSN 6645-00-808-1407
NSN 6685-01-299-4533
NSN 5985-01-596-7536
NSN 6150-01-612-1425
NSN 2925-00-781-8421
NSN 6610-01-398-8815