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公开(公告)号：US2864945A
公开(公告)日：1958-12-16
申请号：US47513254
申请日：1954-12-14
Applicant: STANDARD COIL PROD CO INC
Inventor： RICHARD BULL , ROBERT ELAND
IPC: H03B5/34
CPC classification number: H03B5/34
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