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摘要
申请公布号
US2024426(A)
申请公布日期
1935.12.17
申请号
US19310563769
申请日期
1931.09.19
申请人
NORDBERG MANUFACTURING CO.
发明人
BUTLER ROBERT S.
分类号
B01D33/25
主分类号
B01D33/25
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