Memuat
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author
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...lihat lebih banyakDr 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.lihat lebih sedikit