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发明名称
Blackboard stencil
摘要
申请公布号
US2090186(A)
申请公布日期
1937.08.17
申请号
US19350001281
申请日期
1935.01.11
申请人
CORBETT WILLIAM H
发明人
CORBETT WILLIAM H.
分类号
B43L1/04
主分类号
B43L1/04
代理机构
代理人
主权项
地址
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