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公开(公告)号：CA448475A
公开(公告)日：1948-05-11
申请号：CA448475D
Applicant: SHELL DEV
Inventor： ROSS WILLIAM E , VERMEULEN THEODORE
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公开(公告)号：CA464347A
公开(公告)日：1950-04-11
申请号：CA464347D
Applicant: SHELL DEV
Inventor： MCALLISTER SUMNER H , CRAWFORD CHESTER C , VERMEULEN THEODORE
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