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 5998-00-484-9439
NSN 5925-01-157-9142
NSN 5915-01-331-2485
NSN 6150-00-986-3427
NSN 6620-01-367-0844
NSN 5930-01-350-8707
NSN 5965-00-342-5126
NSN 6685-01-578-5953
NSN 5950-00-698-2773
NSN 5998-01-065-7867
NSN 5945-00-273-9481
NSN 5990-01-179-5625