Assignee

HISADA MASAYA

JP·1 granted patent·6 citations·filing 2012–2012

Technology mixC21D1 C22C1 E21B1 Y02P1

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0181US8430977B2Hollow drilling steel rod and method of manufacturing the sameHISADA MASAYA·Filed 2012·Granted Apr 30, 2013·6 cites·2 claims

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