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E D Yardley
Dr E. D. Yardley C Eng, PhD, MIMMM, MIMechE is a retired Consultant Engineer, who has more than 30 years' experience of development, testing and practical application of equipment in the coal minin...показать большеDr E. D. Yardley C Eng, PhD, MIMMM, MIMechE is a retired Consultant Engineer, who has more than 30 years' experience of development, testing and practical application of equipment in the coal mining industry.показать меньше