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| US4128136 | 9 Dic 1977 | 5 Dic 1978 | Lamage Limited | Drill bit | | US4234048 | 12 Jun 1978 | 18 Nov 1980 | Christensen, Inc. | Drill bits embodying impregnated segments | | US4351401 | 13 Jun 1980 | 28 Sep 1982 | Christensen, Inc. | Earth-boring drill bits | | US4592433 | 4 Oct 1984 | 3 Jun 1986 | Strata Bit Corporation | Cutting blank with diamond strips in grooves | | US7000604 | 12 Dic 2001 | 21 Feb 2006 | Robert Bosch GmbH | Cutting tool |
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