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公开(公告)号：US3431996A
公开(公告)日：1969-03-11
申请号：US3431996D
申请日：1965-09-20
Applicant: NAT RES DEV
Inventor： GILES CYRIL GEORGE , MARTIN JAMES ALEXANDER , SPINDLOW JOHN RICHARD
CPC classification number: G05D1/0265
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