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1990

(Summary description)In 1990, the diamond coring bit design and manufacturing technology of Hughes Christensen Company in the United States was introduced.

1990

(Summary description)In 1990, the diamond coring bit design and manufacturing technology of Hughes Christensen Company in the United States was introduced.

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In 1990, the diamond coring bit design and manufacturing technology of Hughes Christensen Company in the United States was introduced.

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