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公开(公告)号：US2264139A
公开(公告)日：1941-11-25
申请号：US29131239
申请日：1939-08-22
Applicant: PERMUTIT CO
Inventor： MONTGOMERY JAMES M , AULTMAN WILLIAM W
IPC: C02F1/52
CPC classification number: C02F1/5281
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