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公开(公告)号：CA466732A
公开(公告)日：1950-07-18
申请号：CA466732D
Applicant: SHELL DEV
Inventor： BALLARD SEAVOR A , HAURY VERNON E
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公开(公告)号：CA449161A
公开(公告)日：1948-06-15
申请号：CA449161D
Applicant: SHELL DEV
Inventor： BALLARD SEAVOR A , HAURY VERNON E
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