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Gustavo Witt: Biography The Author of this Blog is a graduate in Chemical Engineering. During his professional life, he worked as Site Manager and finally as President of a Construction and Industrial Installations Company. During his professional career, he built Chemical Processes, Refineries, Gas Pipelines, Compressor Plants and Thermal Power Plants in his country and abroad. As a result of this experience, the author offers the reader this Blog and the recently published books. The man-hour tables in this ebook have been used by the author throughout his professional career.