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公开(公告)号：US2986888A
公开(公告)日：1961-06-06
申请号：US74443158
申请日：1958-06-25
Applicant: CALIFORNIA RESEARCH CORP
Inventor： BORRMANN GERALD F , ALEXANDER HILDEBRAND
IPC: B63B21/50
CPC classification number: B63B21/50
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