42 Scientific research; technical consultation and research in the fields of industrial design, engineering, data analysis, data warehousing, data collaboration and data visualization; computer programming for others; designing, updating and maintaining computer software and computer programs for others; industrial design services for others; personal letter writing for others; surveying and engineering services; quality control for others; construction drafting; design for others in the field of engineering; oil field surveys; oil-well testing; analysis of oil fields; oil field exploration