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发明名称
Bifurcated drawing instrument
摘要
申请公布号
US2041299(A)
申请公布日期
1936.05.19
申请号
US19330701578
申请日期
1933.12.09
申请人
KEUFFEL & ESSER CO.
发明人
NEUMAYER EDUARD
分类号
B43L9/24
主分类号
B43L9/24
代理机构
代理人
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地址
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