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公开(公告)号：US3466241A
公开(公告)日：1969-09-09
申请号：US3466241D
申请日：1967-12-27
Applicant: NAT RES DEV
Inventor： SIMPSON JAMES ROXBY
CPC classification number: C02F3/082 , B60C3/02 , B60C15/0233 , Y02W10/15
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