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公开(公告)号：US3114009A
公开(公告)日：1963-12-10
申请号：US64464157
申请日：1957-03-07
Applicant: ARMOUR RES FOUND
Inventor： MARVIN CAMRAS , BROPHY JAMES J
IPC: G11B5/37
CPC classification number: G11B5/37
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