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发明名称
Duplicating stamp
摘要
申请公布号
US1996645(A)
申请公布日期
1935.04.02
申请号
US19330665541
申请日期
1933.04.11
申请人
HELFRICH GEORGE J
发明人
HELFRICH GEORGE J.
分类号
B41L9/00
主分类号
B41L9/00
代理机构
代理人
主权项
地址
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