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31.发明授权Machine for preparing fibrous material for pneumatic conveyance and discharge 失效用于制备用于气动输送和排放的纤维材料的机器
公开(公告)号：US2517903A
公开(公告)日：1950-08-08
申请号：US1324848
申请日：1948-03-05
Applicant: LUHRMANN GEORGE W
Inventor： LUHRMANN GEORGE W
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