MACHINES PARTS MADE OF CERAMICS USED IN THE FIELD OF MECHANICAL ENGINEERING, NAMELY, WELDING PINS [ AND WELDING SLEEVES ] USED FOR RESISTANCE WELDING, TO LOCATE METAL PARTS, FOR ELECTRICAL INSULATION TO AVOID STICKING OF SPUTTERING AND STUD WELDING [, NOZZLES USED FOR AIR-TEXTURING, INTERLACING, TANGLING AND SPIN FINISH MIGRATION IN THE AREA OF FILAMENTS OF CHEMICAL FIBRES, BROACHES, MOLD INSERTS, STAMPING DIES, CLINCH DIES, PUNCHING DIES, PUNCHING SLEEVES, CENTERING SLEEVES, MANDREL FOR DRA...