1990
- Categories:Development history
- Author:
- Origin:
- Time of issue:1990-01-01
- Views:0
(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.
- Categories:Development history
- Author:
- Origin:
- Time of issue:1990-01-01
- Views:0
In 1990, the diamond coring bit design and manufacturing technology of Hughes Christensen Company in the United States was introduced.
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