42 research, design and engineering for others in the fields of treatment and purification of water, treatment of industrial and household waste, treatment of sludge and ashes, re-use of industrial and household waste and of sub-products derives from the treatment of water, sludge, industrial and household waste; regularization of chemical products in effluents in water and sludge; consultancy and expertise in the treatment of water, effluent, industrial and household waste, sludge and ashes from urban and industrial plants; technical consultation for the selection and optimization of the above-mentioned chemical products for the improvement in the conditions of use of these products and follow-up of the efficiency of these products; technical consultation for improvement in condition of use of the above-mentioned apparatus and instruments, and follow-up of the efficiency of such apparatus and instruments; drafting construction plans for sewage treatment plants; quality control; professional consultancy services in the field of sewage treatment plants; bacteriological and chemical research for others; research and design for others in the fields of heating, air-conditioning and acoustics engineering; consultancy and expertise in heating, air-conditioning and acoustics engineering; technical consultation in the field of heating, air-conditioning and acoustics engineering; technical consultation for improvement in conditions of use of the above-mentioned appliances and instruments; research and design for others in the field of production, processing and distribution of electricity and oil products; consultancy and expertise in the processing of electricity and oil products; technical consultation to improve conditions of use of the above-mentioned appliances and instruments; oil and gas prospecting; oil field expertise consultation; geological expertise consultation; geological prospecting and research for others; research, design and engineering for others in the field of construction work and erection of buildings; drafting building plans; geological prospecting, expertise and consultation in the field of construction; technical consultation to improve conditions of use of the above-mentioned appliances and instruments; data processing consultancy; insurance claims processing services; software development for others; rental of computers; computer programming for others; lease drafting services; news and press agency services, namely, gathering and dissemination of news; news reporting services; acoustics engineering services; blood bank services, esthetic surgery services; pharmaceutical consultancy; cosmetic research; child nurseries; dental service dispensaries; patient health care services; retirement homes; convalescent homes; rest homes; massage services; sanitariums; health services, funeral home services; cafeteria services, cafe-restaurants; canteen services, hotel services; hotel bookings; weather forecasting and reporting services; rental of temporary lodgings camp site lodging services; reservations of temporary lodgings; holiday homes; fast, non-stop catering services, snack bars; self-services restaurants; and meal catering; rental of access time to data base servers