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 6645-00-171-9639
NSN 6105-01-555-4426
NSN 5965-00-882-6949
NSN 5975-00-516-1771
NSN 6320-00-160-0899
NSN 5998-01-599-0129
NSN 5950-01-432-5518
NSN 5985-01-534-1328
NSN 5975-01-167-9758
NSN 5985-01-316-2007
NSN 5905-01-138-2687
NSN 5920-01-144-1500