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发明名称
Operating board
摘要
申请公布号
US1801907(A)
申请公布日期
1931.04.21
申请号
US19290365888
申请日期
1929.05.25
申请人
DOUGLASS ANDREW D
发明人
DOUGLASS ANDREW D.
分类号
A61D3/00
主分类号
A61D3/00
代理机构
代理人
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地址
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