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发明名称
Drafting appliance
摘要
申请公布号
US1807237(A)
申请公布日期
1931.05.26
申请号
US19280326260
申请日期
1928.12.15
申请人
DE POSTELS THEODORE A
发明人
POSTELS THEODORE A. DE
分类号
B43L13/14
主分类号
B43L13/14
代理机构
代理人
主权项
地址
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