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 5998-01-525-4980
NSN 5999-01-307-0561
NSN 5960-01-307-6692
NSN 6320-00-174-1362
NSN 6240-01-542-1448
NSN 2925-01-138-8104
NSN 5930-01-551-7512
NSN 5985-00-295-5998
NSN 5920-00-246-4657
NSN 5950-01-171-5750
NSN 5960-00-915-6269
NSN 5925-00-394-6894