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 5915-01-614-7157
NSN 6110-01-607-0891
NSN 5925-00-904-5763
NSN 6150-01-445-3306
NSN 7035-01-076-4067
NSN 5905-00-905-3335
NSN 6110-00-999-3130
NSN 5920-01-627-5753
NSN 5960-01-502-3268
NSN 5855-01-466-1588
NSN 6320-00-725-0754
NSN 5925-00-482-2396