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发明名称
Spiral binding
摘要
申请公布号
US2147369(A)
申请公布日期
1939.02.14
申请号
US19360096571
申请日期
1936.08.18
申请人
SPIRAL BINDING CO. INC.
发明人
GRUMBACHER WALTER
分类号
B42B5/12
主分类号
B42B5/12
代理机构
代理人
主权项
地址
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