42 Engineering, in particular in relation to creating prototypes, patterns, models, [ moulds ] and small-batch parts and mass-production parts, including by means of 3D CAD and in the fields of the treatment of materials, design of moulds, plastics *, * [ and die cutting technology, injection moulding, investment casting and vacuum moulding, surface finishing and surface coating, ] microstructure and microsystems engineering; technological consultancy and planning in the field of engineering; construction drafting; engineering services, namely, technical project planning, project preparation and project management, for others, in relation to creating prototypes, patterns, models, [ moulds ] and small-batch parts and mass-production parts, including by means of 3D CAD, and in the fields of the treatment of materials, design of moulds, plastics and die cutting technology, [ injection moulding, investment casting and vacuum moulding, surface finishing and surface coating, ] microstructure and microsystems engineering; quality control for others, namely, industrial testing, verification and optimisation of existing prototypes, patterns, models, [ moulds, tools and ] small-batch parts and mass-production parts; industrial design; design, in particular of devices for constructing prototypes [ and moulds, ] and in the fields of microstructure and microsystems engineering