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公开(公告)号：US2697999A
公开(公告)日：1954-12-28
申请号：US35049653
申请日：1953-04-22
Applicant: STANDARD OIL DEV CO
Inventor： CROOKSTON ROBERT R , IRVING MOSER
IPC: B60C23/04
CPC classification number: B60C23/0403
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