37 Machinery installation, maintenance and repair, namely, installation, maintenance and repair of mechanically-operated devices for the mixing, dissolving, homogenizing, emulsifying, dispersion, suspension, gas-injection ofliquid to highly viscous substances, and their parts and accessories as well as consultancy in this regard;Machinery installation, maintenance and repair, namely, installation, maintenance and repair of mechanically-operated devices for introducing, dissolving and mixing of powdery substances in liquid and highly viscous media,and their parts and accessories as well as consultancy in this regard; Machinery installation, maintenance and repair, namely, installation, maintenance and repair of machines for the manufacture of paints, lacquers and pigment and filler suspensions as chemical slurries, jetstream mixers, dispersion machines, and their parts and accessories as well as consultancy in this regard