Other

Nicoll A Campbell

Cornelius Phaal

Henry B Dyer

Rainer Dietrich

Douglas J Reid

A method of making inserts suitable for tool or drill bits which includes the step of fragmenting, e.g. by means of a laser beam, an abrasive compact in a plurality of discrete, non-segmental fragments. The inserts may have a variety of shapes, some of which are new, such as conical, truncated conical or truncated pyrimidal. The inserts are particularly useful for wire-drawing die blanks and core or oil-well drill bits.

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Parkview, Johannesburg, Transvaal, South Africa

Nicoll A Campbell