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公开(公告)号：US2228038A
公开(公告)日：1941-01-07
申请号：US21585238
申请日：1938-06-25
Applicant: SHELL DEV
Inventor： JOHANNES SCHURINK HENDRIK BERE , WILLEM COLTOF
IPC: C11B3/06
CPC classification number: C11B3/06
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