[ ELECTRONIC INSTRUMENTS FOR NON-DESTRUCTIVE MATERIAL TESTING; ] ELECTRONIC INSTRUMENTS FOR DETECTING SURFACE DEFECTS IN SEMI-FINISHED PRODUCTS; [ ELECTRONIC INSTRUMENTS FOR MEASURING ELECTRICAL AND MAGNETIC PROPERTIES; AND ELECTRONIC INSTRUMENTS FOR MEASURING COATING AND FOIL THICKNESS OF TANGIBLE OBJECTS; DETECTORS FOR FERROMAGNETIC ] AND METALLIC OBJECTS; ELECTRONIC DATA PROCESSORS FOR THE CONTROL OF AFOREMENTIONED GOODS; AND FOR EVALUATING THE INFORMATION OBTAINED THEREIN; PARTS OF ALL OF...