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申请公布号
US2106549(A)
申请公布日期
1938.01.25
申请号
US19350019218
申请日期
1935.05.01
申请人
THE DORR COMPANY, INC.
发明人
COULTER HAROLD BOYD
分类号
B03B5/48
主分类号
B03B5/48
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