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| Number | Title | Issue Date |
| 6854536 | Pile reamer with spoil container The present application relates to a tool having a cutting apparatus for enlarging a portion of an underground pile shaft. The tool is provided with a collecting device which is disposed below the cutting means in order that spoil generated when performing a cutting... | 02/15/2005 |
| 4381118 | Multi-hitch apparatus for tandem towing of farm implements Apparatus for connecting a plurality of towed portable farm implement in optional dual configurations characterized by a first position wherein the farm implements are towed in a staggered or offset relationship to one another for field use and a second p... | 04/26/1983 |
| 4125167 | Big hole bit A large diameter drill bit having a plurality of rolling cutters is provided with permanent magnets mounted on flexible flaps to collect magnetic debris on the bottom of a drill hole. A flap carrying a permanent magnet is mounted adjacent each cutter, or ... | 11/14/1978 |
| 4102413 | Rock drilling apparatus and method A method of drilling a large hole through rock and removing the drilling waste by drilling a pilot hole from one rock face to another, reverse drilling with a large drill bit and removing the waste during the reverse drilling by pressurizing the pilot hol... | 07/25/1978 |
