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A tensator spring lays coiled up on the floor after being stretched out Feb. 13, 2015, at Fairchild Air Force Base, Wash. Tech. Sgt. Christopher Putnat, a 373rd Training Squadron, Detachment 13 hydraulics instructor, briefed his class and showed the dangers of tensator springs when they are not properly used. (U.S. Air Force photo/Airman 1st Class Nicolo J. Daniello)
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