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发明名称
Drafting instrument
摘要
申请公布号
US2784497(A)
申请公布日期
1957.03.12
申请号
US19550513307
申请日期
1955.06.06
申请人
BLONDIN DONALD F
发明人
BLONDIN DONALD F.
分类号
B43L13/20
主分类号
B43L13/20
代理机构
代理人
主权项
地址
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