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公开(公告)号：US1715892A
公开(公告)日：1929-06-04
申请号：US4649925
申请日：1925-07-27
Applicant: STANDARD OIL DEV CO
Inventor： BECKER ARMAN E , BOEHM ARTHUR B
IPC: C14C9/02
CPC classification number: C14C9/02
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