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오거 스크류용 토사 제거 장치
Inventionpatent.status.granted
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§ Ⅰ
Dossier Overview
IPC Classification
E21B 12/6E2D 13/E21B 7/
CPC Classification
E21B12/6E2D13/E21B7/5E2D2250/38
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IPC Classification
CPC Classification
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