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公开(公告)号：US3496857A
公开(公告)日：1970-02-24
申请号：US3496857D
申请日：1968-08-16
Applicant: NAT RES DEV
Inventor： ELLIS DAVID JOHN , SANDERS MALCOLM JACK
CPC classification number: B08B15/023 , B08B2215/003
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