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1.发明授权
公开(公告)号：US2121170A
公开(公告)日：1938-06-21
申请号：US15000737
申请日：1937-06-23
Applicant: SHOZO KONISHI
Inventor： SHOZO KONISHI
IPC: G11B3/70
CPC classification number: G11B3/70 , Y10T156/1036 , Y10T156/1039 , Y10T156/1062 , Y10T156/1066
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