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公开(公告)号：US2988892A
公开(公告)日：1961-06-20
申请号：US74547158
申请日：1958-06-30
Applicant: CALIFORNIA RESEARCH CORP
Inventor： BORRMANN GERALD F , LIND EDWARD R , RIPPE BEN K
IPC: B63B21/50
CPC classification number: B63B21/50
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