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 5905-01-477-7872
NSN 5915-00-845-7278
NSN 6610-01-563-4312
NSN 5935-01-170-4884
NSN 5905-00-764-0994
NSN 5910-01-294-1316
NSN 6685-01-100-1071
NSN 6220-01-576-4194
NSN 6150-01-487-7841
NSN 6610-00-664-2190
NSN 5945-01-436-8263
NSN 5935-01-629-7077