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Percussion - Stone hammer

139 bytes added, 00:45, 1 June 2012
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==Construction, operations and maintenance==
Equipment is commercially produced in western countries. Local production is possible. Percussion drilling is hard work. Use of a small engine may be appropriate.
 
[[File: Drilling Method Selection.jpg|thumb|center|600px|Drilling Method Selection. Chart: WEDC Loughborough University Leicestershire.]]
==Costs==
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