42 Scientific services and technological consultancy, in particular, design engineering consultancy related to optical layer design, layer design, manufacturing process development, layer stack analysis, surface analysis; engineering services; computer modeling services, in particular, simulation of machine layout; architectural services, construction development services, in particular, computer modeling services for simulation of building layout, civil engineering services, computer project management, physics research, technical measurement evaluations in the technology and consumer goods industry for coating properties, substrate properties, optical properties, layer stack properties, transmission/absorption/reflection spectra, hardness, abrasion properties, and surface angle; engineering services in the field of optics and optical coatings; technical tests and checks, in particular, technical product safety testing, product quality testing, in particular, mechanical, electrical, gas flow, thermal simulations to test conformance of optics to operational requirements; software design; technical measurement evaluations and product testing in the industrial optics industry of coating properties, substrate properties, optical properties, layer stack properties, transmission/absorption/reflection spectra, hardness, abrasion properties of optics; scientific research, in particular, conducting of scientific experiments, engineering services, in particular, [technical development of solar and photovoltaic installations, ]technical consultancy in the field of computer expertise in coating-layer stack design and product design; scientific consulting, in particular, providing expertise in computer coating-layer stack design and product design for others, product testing; scientific research in the field of technology, construction drafting, product quality testing, in particular, layer property testing, abrasion, hardness, surface angle, reflection, absorption, product failure mode analysis, styling, in particular, industrial design. engineering consultancy in the field of optical layer stack design, low-e optical reflection control design, technical project studies, in particular conducting product and production feasibility studies in the field of industrial optics, device maintenance and repair analyses; engineering services, particularly technical project planning and design engineering of optical coating design; scientific consultancy relating to environmental protection and environmental impact assessments