Norton Christensen, Inc.

Heinz-Juergen Panhorst

Hans-Eckhard Mengel

Hans Schillinger

Siegfried Starke

Klaus Pahlke

A drill bit for drilling bore holes in underground formations comprising a bit body with a connecting spigot for connecting to a drill string or the like, and a cutting head which comprises a circumferential face extending parallel to its longitudinal axis and an end face having a drilling axis which is aligned with the axis of the connecting spigot. The drilling axis is parallel to and is offset relative to the axis of the cutting head. It is preferred that the end face is, at least in part, conical in shape.

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Nienhagen, Germany

Heinz-Juergen Panhorst