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 6135-01-452-2421
NSN 5835-01-485-0210
NSN 6110-01-427-0161
NSN 5950-01-108-6392
NSN 6650-00-111-1081
NSN 7035-00-096-9986
NSN 5895-00-151-3934
NSN 5895-00-475-1858
NSN 6610-01-461-8180
NSN 5960-01-364-1318
NSN 5985-01-252-8822
NSN 5855-01-161-8964