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发明名称
Improvements in or relating to ring book mechanisms
摘要
申请公布号
GB467074(A)
申请公布日期
1937.06.10
申请号
GB19370001508
申请日期
1937.01.18
申请人
CARL RUDOLF EHRLUND;JOHAN EDVARD MACNUSSON
发明人
分类号
B42F13/26
主分类号
B42F13/26
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