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公开(公告)号：US3250099A
公开(公告)日：1966-05-10
申请号：US29333463
申请日：1963-07-08
Applicant: NAT RES DEV
Inventor： WILLIAM NORTH CHARLES , JOHN BOLD , JACK LEICESTER
IPC: D06B3/20
CPC classification number: D06B3/201
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