Medical and surgical apparatus and instruments; orthopaedic prostheses and ortheses; exoprostheses and orthopaedic implants of artificial materials, and parts therefor; femur neck endoprostheses and hip stem endoprostheses for artificial hip joints; medical and surgical instruments for orthopaedic prostheses, implants, ortheses, and for exoprostheses; castings made from common metals and their alloys, being semi-manufactured and finished products for prostheses and/or implants included in this class