Hardness critical item
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 5950-01-212-0890
NSN 4140-01-392-2107
NSN 5998-01-401-5396
NSN 4140-00-732-9427
NSN 5999-01-041-1540
NSN 5910-01-167-8593
NSN 5965-01-641-2318
NSN 6220-01-544-7998
NSN 5905-01-463-2803
NSN 6650-01-607-4157
NSN 5935-01-233-9492
NSN 5965-00-201-7479