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| Number | Title | Issue Date |
| 5853052 | Hydraulic drive for rotation of a rock drill The invention provides an In-The-Hole hydraulic drive unit for rotating a rock drill. A hydraulic motor having a fixed rear trailing end and a rotating front drilling end converts hydraulic power into a rotational drive force. The hydraulic motor receives... | 12/29/1998 |
| 5695014 | Ram boring apparatus A ram boring apparatus has a generally cylindrical body with an attached head, the apparatus being connected to a drive rod which pushes the apparatus forwardly through the earth. The drive rod can also rotate the body and the attached head about the long... | 12/09/1997 |
| 4880065 | Air motor operated rotary earth drilling tool A new and improved air motor operated rotary earth drilling tool for use with a source of high pressure, high volume compressed air has a circulation control housing, a motor housing, a reduction gear housing, and a bearing housing connected longitudinall... | 11/14/1989 |
| 4650370 | High-speed cable-laying apparatus An improved high-speed cable-laying apparatus of the type which digs a kerf, lays a cable at the kerf bottom, and refills the kerf with spoil in one pass. The kerf digger is a chainline loop having ground-cutting teeth spaced along its length and restrict... | 03/17/1987 |
