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发明名称
Filter
摘要
申请公布号
US2457958(A)
申请公布日期
1949.01.04
申请号
US19450576522
申请日期
1945.02.07
申请人
WALKER EARL C
发明人
WALKER EARL C.
分类号
B01D29/11
主分类号
B01D29/11
代理机构
代理人
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