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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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3 ene 1866 año - The Siemens brothers ,Germany develop the open-hearth process of steel making.
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By
Juan Pablo Lopez
24 nov 2017
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3 ene 1866 año
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~ 159 years ago
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