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摘要
申请公布号
US1797498(A)
申请公布日期
1931.03.24
申请号
US19280294805
申请日期
1928.07.23
申请人
FINLEY PERCY C
发明人
FINLEY PERCY C.
分类号
E01F9/07
主分类号
E01F9/07
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代理人
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