Abstract: Apparatus for the mounting and shaping, continuously and at high speed, of contacts on telephonic relay elements, notably blades, non-detached from a supply band, and utilizing balls adapted to be welded to elements of the band to form contacts. A container stores the balls and a distributor slide driven in alternating horizontal movement receives a plurality of balls fed from the container and feeds the balls to respective recesses formed in the upper horizontal surface of an electrode. The electrode is driven in an alternating horizontal movement between a first position for reception of the balls and a second position where it is placed under the relay band and a counter-electrode is driven vertically towards the band to effect welding of the contacts to the elements of the band.