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公开(公告)号：US3174295A
公开(公告)日：1965-03-23
申请号：US13607361
申请日：1961-09-05
Applicant: PHILLIPS PETROLEUM CO
Inventor： HAWKINS HAROLD M , BECK EDWARD R
IPC: B29B13/04
CPC classification number: B29B13/04
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