CORE GEOTECHNICS CO., LTD.
CORE GEOTECHNICS CO., LTD. Patent applications | ||
Patent application number | Title | Published |
---|---|---|
20120061145 | METHOD AND APPARATUS FOR DRILLING LARGE-DIAMETER HOLE IN GROUND - The present invention relates to method and apparatus for drilling a large diameter hole in the ground. The present invention comprises a hammer drill ( | 03-15-2012 |