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公开(公告)号：US2754309A
公开(公告)日：1956-07-10
申请号：US34038853
申请日：1953-03-04
Applicant: STALEY MFG CO A E
Inventor： HANS WOLFF , HAYES LESTER P
IPC: C11B3/00
CPC classification number: C11B3/00
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