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公开(公告)号：US2235466A
公开(公告)日：1941-03-18
申请号：US21212838
申请日：1938-06-06
Applicant: SHELL DEV
Inventor： PESKI ADRIANUS JOHANNES VAN , NIEOLAAS MAX , MELSEN JOHANNES ANDREAS VAN , LUCAS STEDEHOUDER PIETER
CPC classification number: B24B41/002 , C10L1/24
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