The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 7510354 | Tool and a cutting insert for chip removing machining The invention relates to a cutting tool including a basic body and a cutting insert detachably connected to the basic body via an interface, which includes a pair of co-operating connecting surfaces in which engagement means are included, which may be in the form of... | 03/31/2009 |
| 7476061 | Turning tool and an indexable turning insert, as well as an attachment for such turning tools An indexable turning insert, which has a symmetrical, preferably rotationally symmetrical basic shape, that is determined by a clearance surface extending between a top side and an underside, and which includes a cutting edge as well as a coupling device located to ... | 01/13/2009 |
| 7387474 | Cutting insert and a tool for chip removing machining, as well as an attachment for such tools A cutting insert having a front cutting edge and a connecting surface including male- and/or female-like engagement portions, in order to rigidly secure the cutting insert, a geometrically predetermined reference locus serving as a force-application spot for the cla... | 06/17/2008 |