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Plunger construction
申请公布号:
US1932451(A)
申请号:
US19320585727
申请日期:
1932.01.09
申请公布日期:
1933.10.31
申请人:
HUGHES TOOL COMPANY
发明人:
EVANS SETH
分类号:
E21B37/04;F04B47/12
主分类号:
E21B37/04
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