Fluid operated undercutter

E - Fixed Constructions – 21 – B

Patent

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E21B 10/00 (2006.01) B23B 29/034 (2006.01) B23B 51/00 (2006.01) B25D 9/00 (2006.01) B28D 1/14 (2006.01) B28D 1/26 (2006.01)

Patent

CA 1062241

A B S T R A C T An undercutter comprising a substantially tubular body portion adapted to be received within a parallel-sided hole, a rotary percussion head journalled in one end of said body and having one or more cutting tools adapted to cut outwardly from the axis of said body, means for rotating said head about the axis of said body and means for operating said percussion head.

267531

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