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 5998-00-939-1500
NSN 6220-00-386-0997
NSN 5855-01-441-1392
NSN 6110-01-298-6847
NSN 6135-00-838-7008
NSN 5915-01-553-6738
NSN 7035-01-477-2818
NSN 5960-00-283-6235
NSN 5915-01-648-7354
NSN 5950-01-150-1000
NSN 6610-00-720-8775
NSN 5975-01-250-4239