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| Number | Title | Issue Date |
| 5860482 | Multiple force hole forming device A device and method for forming a downwardly extending hole in the surface of the earth for seismic exploration or for forming a larger diameter hole such as made during exploratory drilling. The hole forming device includes an elongated rigid planting me... | 01/19/1999 |
| 5281775 | Vibrating hole forming device for seismic exploration A vibrating hole forming device for seismic exploration in which a vertically elongated mounting pipe with attached rack gear is powered vertically by a hydraulically driven pinion gear which will mechanically push the pipe downwardly into the earth's sur... | 01/25/1994 |
