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公开(公告)号：US3386017A
公开(公告)日：1968-05-28
申请号：US37465164
申请日：1964-06-12
Applicant: NAT RES DEV
Inventor： EDWARD BALL FRANCIS , WILLIAM MARTIN JOHN
CPC classification number: H01C17/22 , B30B11/005
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