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 6135-01-316-9794
NSN 4140-00-552-7370
NSN 4140-01-017-8292
NSN 2925-00-137-5120
NSN 5910-00-850-0691
NSN 5855-00-494-9581
NSN 6610-00-253-3549
NSN 6130-01-632-2101
NSN 5950-01-086-8391
NSN 6620-00-140-5292
NSN 5925-00-382-3574
NSN 5950-01-293-3172