42 Product research and development; product research and development in the field of silver alloy soldiering; product research and development in the field of electronic components soldiering; product research and development in the field of metal working; product research and development in the field of sintering; product research and development in the field of chemicals for use in the industry, particularly metal working; scientific and technological services, particularly research services in the field of silver alloy soldering; science and technology services, particularly engineering services in the field of metal working; scientific and technological services, particularly engineering services in the field of electronic component soldiering, computer component soldiering and technical soldering; scientific and technological services, particularly research services in the field of chemicals for use in the metal industry; industrial process development in the field of metal working; industrial process development in the field of chemicals in use for the metal industry; industrial process development in the field of metal workings; industrial process development in the field of soldiering and sintering agents