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 5950-01-090-0672
NSN 5835-00-187-1481
NSN 6645-01-088-5244
NSN 5990-01-443-2931
NSN 5950-00-247-0985
NSN 6610-01-305-8863
NSN 5935-01-095-9988
NSN 5950-00-902-1260
NSN 5855-00-879-7245
NSN 6110-01-305-5062
NSN 6130-00-900-8134
NSN 7035-01-283-2536