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摘要
申请公布号
US3292507(A)
申请公布日期
1966.12.20
申请号
US19650444934
申请日期
1965.03.24
申请人
MINNESOTA MINING AND MANUFACTURING COMPANY
发明人
VANSTRUM ROBERT C.
分类号
E01F9/06
主分类号
E01F9/06
代理机构
代理人
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地址
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