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公开(公告)号：US3432000A
公开(公告)日：1969-03-11
申请号：US3432000D
申请日：1967-03-21
Applicant: SHELL OIL CO
Inventor： ONGKIEHONG LEO , MAST HARM
CPC classification number: G01V1/201 , B06B1/0655
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