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copper mining equipment used in the 20th century

copper mining equipment used in the 20th century

Copper Mining Equipment Used In The 20th Century Niques that continued to be used at rio tinto into the 20th britain copper and tin were worked in cornwall and traded with the phoenicians as early as 1500 remans brought improved metallurgical techniques to britain and spurred devel3ira moncopper the encompassing story of

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