
John Thomas Simpson · 英语
John Thomas Simpson · 英语
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原文 (英语)
ACKNOWLEDGMENTS The author begs to acknowledge his indebtedness for valuable information to: A.A. Drew, Superintendent of Agencies, of the Mutual Benefit Life Insurance Company, Newark, New Jersey, for Constructive Banking and Life Insurance. Bucyrus Company, South Milwaukee, Wisconsin, for Trenching with Steam Shovels. Waterloo Cement Machinery Company, Waterloo, Iowa, for Concrete Mixing Machines. Hercules Powder Company, Hazleton, Pennsylvania, for Progressiv
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