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发明名称
Carbon indicator for writing machines
摘要
申请公布号
US2078457(A)
申请公布日期
1937.04.27
申请号
US19350020849
申请日期
1935.05.10
申请人
AMERICAN SALES BOOK COMPANY
发明人
PRINGLE WILLIAM A.;MANUEL CHARLES J.
分类号
B41L5/10
主分类号
B41L5/10
代理机构
代理人
主权项
地址
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