| http://www.w3.org/ns/prov#value | - This became apparent when at last the great point, which lies at the bottom of all enterprises, was considered -- namely, the question: Does it pay?Wages were low in Europe, especially at that time, and always much lower than here, while the materials consumed in the battery -- zinc and acids cost much more there than they do here now, thanks to the great improvements of manufacturing processes wh
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