E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/40
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
Allan David T.
John Macdonald And Company (pneumatic Tools) Limited
LandOfFree
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