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公开(公告)号：US2084484A
公开(公告)日：1937-06-22
申请号：US5109435
申请日：1935-11-22
Applicant: STANDARD OIL DEV CO
Inventor： EDWARDS DAVID F , WILLSON ARTHUR M
IPC: B04B1/12
CPC classification number: B04B1/12 , Y10S494/901
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