lasers for medical use and calibration plates therefor

Chemicals used in industry and science; soldering and welding chemicals, metal soldering and welding products and preparations, namely, tempering chemicals for use in metal working or soldering; tempering chemicals and chemical preparations for use in soldering and welding, tempering chemicals for metalworking or soldering; metal hardening preparations, namely, metal plating chemical compositions; carbide powder for industrial purposes; carbide powder for laser hardfacing; carbide [ ; gases f...