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经营范围
发明名称
Permanent binder for loose leaves
摘要
申请公布号
GB361067(A)
申请公布日期
1931.11.19
申请号
GB19300030931
申请日期
1931.07.15
申请人
GEORGE STEVENS
发明人
分类号
B42F13/08
主分类号
B42F13/08
代理机构
代理人
主权项
地址
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