نمایش نتیجه 1 تا 5 از 5 نتیجه یافت شده برای rock drill:
n: The impregnated bit used to drill the formation of big hardness and high abrasivity.
n: refer to rock drillability
n: 1. a rock drill that is pneumatically powered and usually held by the operator.2. an air hammer.
n: a drill generally powered by compressed air and used to drill holes for explosives. Rock drills may be required in pipeline right-of-way grading and in ditching.
n: The hard drgree of crushing rock when drilling.
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