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发明名称
Book cover protector
摘要
申请公布号
US2057986(A)
申请公布日期
1936.10.20
申请号
US19350031467
申请日期
1935.07.15
申请人
WALRAVEN ALBERT T
发明人
WALRAVEN ALBERT T.
分类号
B42D3/04
主分类号
B42D3/04
代理机构
代理人
主权项
地址
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