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 6320-01-539-0994
NSN 5990-01-134-7756
NSN 6150-01-481-2822
NSN 2925-00-228-8854
NSN 4140-01-310-8608
NSN 5965-01-641-4354
NSN 5990-00-524-2293
NSN 5999-00-212-7853
NSN 5920-01-367-5371
NSN 5950-01-374-8325
NSN 5925-01-090-8657
NSN 6240-01-461-8193