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 5855-00-198-3197
NSN 6150-00-074-1499
NSN 6240-01-145-3931
NSN 5920-01-084-5118
NSN 2925-00-471-1128
NSN 5990-01-534-8609
NSN 5998-00-219-4186
NSN 5925-00-807-9294
NSN 5996-00-026-9118
NSN 5965-00-973-9974
NSN 6105-01-257-1870
NSN 5960-01-325-2241