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Drawpoint
Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
Heavy chisel cut across the face of a bit blank a short distance from a diamond to serve as a starting point for calking the metal toward and around a diamond being handset.
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Drive casing, английский
Heavy, thick-walled casing, which is stronger than standard casing, and hence may be driven through overburden or material with less danger of being damaged than standard casing.
Diamond impregnated, английский
Having diamonds distributed throughout a matrix. compare surface set.
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