THE PRODUCT (11) IS IN RELATIVE DISPLACEMENT IN THE DIRECTION (12) OF ITS AXIS WITH RESPECT TO AT LEAST ONE MAGNETIC INDUCTOR (10.10 ''). THE METALLURGICAL PRODUCT (11) IS SUBMITTED TO AT LEAST TWO MAGNETIC FLOWS (19, 19``) THAT HAVE NON-PARALLEL DIRECTIONS IN CROSSWAY WITH RESPECT TO THE LONGITUDINAL DIRECTION OF THE PRODUCT (11). THE OVERHEATING DEVICE MAY BE CONSTITUTED IN ADVANTAGE OF TWO MAGNETIC HEADS (14, 14``) IN THE FORM OF C SEPARATED AND ANGULARLY DECALED ACCORDING TO THE AXIAL DIRECTION (12) OF MOVEMENT OF THE PRODUCT (11).
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