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公开(公告)号：CA454232A
公开(公告)日：1949-01-18
申请号：CA454232D
Applicant: SHELL DEV
Inventor： BALCKBURN BILLEE O , ADELSON DAVID E , HATCH LEWIS F
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公开(公告)号：CA454231A
公开(公告)日：1949-01-18
申请号：CA454231D
Applicant: SHELL DEV
Inventor： BALCKBURN BILLEE O , ADELSON DAVID E , HATCH LEWIS F
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