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公开(公告)号：CA523786A
公开(公告)日：1956-04-10
申请号：CA523786D
Applicant: SHELL DEV
Inventor： GRIFFIN JOHN R JR , ESS PAUL R VAN
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公开(公告)号：CA483077A
公开(公告)日：1952-05-06
申请号：CA483077D
Applicant: SHELL DEV
Inventor： GRIFFIN JOHN R JR , ESS PAUL R VAN
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