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Staff Sgt. Christopher Hooper, 92nd Maintenance Squadron nondestructive inspection journeyman, uses a magnetic oil bath to ensure the magnetic particle machine is ready to conduct an inspection July 9, 2015, at Fairchild Air Force Base, Wash. With a magnetic particle machine, NDI is able to find cracks on both the inside and outside of a part. (U.S. Air Force photo/Airman Sean Campbell)
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