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Keywords: pneumatic hammer
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Proceedings Papers

Paper presented at the ISRM International Symposium, May 26–28, 1982
Paper Number: ISRM-IS-1982-015
... that changes of rock properties took place at the distance of not more than 1 m from the contour of working section. In this case driv- ing with pneumatic hammer appeared to be the simplest way of coring. Before coring the working section contour surface was thoroughly examined, planes of bedding determined...

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