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发明名称
Drafting instrument
摘要
申请公布号
US2232369(A)
申请公布日期
1941.02.18
申请号
US19400321960
申请日期
1940.03.02
申请人
JAMES EDWIN BELL, JR.
发明人
COFFMAN SAMUEL MCFARLAND;JR. JAMES EDWIN BELL,
分类号
B43L9/00
主分类号
B43L9/00
代理机构
代理人
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地址
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