NON-PRECIOUS METAL ALLOYS IN THE FORM OF BARS AND PLATES FOR GENERAL USE IN THE INDUSTRIAL ARTS; NON-PRECIOUS METAL ALLOYS IN SEMI-FINISHED FORM FOR USE IN ENDOPROSTHETIC SURGERY, IMPLANTS, CARDIAC-PACEMAKER HOUSINGS, LEADS AND CONNECTORS FOR CARDIAC PACEMAKERS, CARDIAC-PACEMAKER ELECTRODES, AND ARTIFICIAL CARDIAC VALVES