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发明名称
Joint for step-down pipe piling
摘要
申请公布号
US2246891(A)
申请公布日期
1941.06.24
申请号
US19390282310
申请日期
1939.06.30
申请人
NATIONAL TUBE COMPANY
发明人
MOISE BOLTON C.
分类号
E02D5/52
主分类号
E02D5/52
代理机构
代理人
主权项
地址
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