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History of the Jeffrey Mining Corporate Center - State Library of Ohio
The Lechner Mining Machine Co. was incorporated to build coal mining machinery. By 1908, Jeffrey sales had risen to $3.9 million with 30% coming from the chain a private telephone system of about 200 phones, and its own water works. In 1926 the company acquired The Diamond Coal Cutter Company Limited of
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Diamonds and the Blockchain | Babson College
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