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发明名称
Riffle block
摘要
申请公布号
US2138313(A)
申请公布日期
1938.11.29
申请号
US19370148637
申请日期
1937.06.17
申请人
ULRICH CHARLES B
发明人
ULRICH CHARLES B.
分类号
B03B5/06;C22B11/10
主分类号
B03B5/06
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