Exemption for intermediate-stage bare copper wires preserved where produced in a continuous same factory winding wire manufacture. Bare copper wires of thickness 2 mm or more that arise as an intermediate product during the continuous manufacture of winding wire from duty-paid copper wire rods within the same factory remain within the scope of the exemption under Notification No. 129/87-C.E., provided the conversion occurs in a continuous process and production is wholly within the same factory of production.