METALLIC AND NON-METALLIC WORKING MATERIALS FOR DOCTORS, DENTISTS AND DENTAL TECHNICIANS' LABORATORIES, VIZ PRECIOUS METALS AND THEIR ALLOYS, ALSO WITH BASE METALS, AS WELL AS BASE METALS AND THEIR ALLOYS, METAL CERAMIC, PORCELAIN-FUSED PRECIOUS METAL ALLOYS, PORCELAIN-FUSED ALLOYS FREE OF PRECIOUS METALS, CERAMICS AND PLASTICS FOR THE PRODUCTION OF INLAYS, CROWNS, BRIDGES, PLATES, MEDICAL AND DENTAL PROSTHESES AND ASSISTANT PARTS FOR PROSTHESES; EMBEDDING MASSES, IMPRINT MASSES, DUPLICATING ...

Measuring apparatus and instruments, electronic or not, for testing the hardness of materials