US1041568A - Diamond drill. - Google Patents
E21B — EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, ... DIAMOND DRILL. APPLICATION FILED KAY 19,1911. Patented 051111912. ... Mono-crystal bar clamp positioning jig and mono-crystal bar clamp positioning method with it GB1402946A (en) 1975-08-13: Parting tool ...
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