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公开(公告)号：US2556854A
公开(公告)日：1951-06-12
申请号：US12427449
申请日：1949-10-29
Applicant: STANDARD OIL DEV CO
Inventor： SPEARS HARRY E , IVAN MAYER
CPC classification number: H02K49/108 , B01F13/0836 , H02K5/128
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