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公开(公告)号：US3504652A
公开(公告)日：1970-04-07
申请号：US3504652D
申请日：1967-11-02
Applicant: PERFECTION PLASTICS INC
Inventor： NORMAN JOHN D
IPC: G03B21/32 , G11B23/027 , G01D11/24
CPC classification number: G11B23/027 , G03B21/323
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