{HEAD ~ An electromagnetically controlled spring clutch mechanism} comprising an input rotating element, {TAIL ~ a rotor}, an armature, a biasing spring for biasing the armature in a direction away from the rotor, an electromagnetic driver for magnetically attracting the armature to the rotor against the biasing action of the biasing spring, and a coil spring 
{ HEAD ~ An electromagnetically controlled spring clutch mechanism } comprising an input rotating element , { TAIL ~ a rotor } , an armature , a biasing spring for biasing the armature in a direction away from the rotor , an electromagnetic driver for magnetically attracting the armature to the rotor against the biasing action of the biasing spring , and a coil spring
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