发明名称 |
Drafting machine |
摘要 |
|
申请公布号 |
US2266765(A) |
申请公布日期 |
1941.12.23 |
申请号 |
US19390290962 |
申请日期 |
1939.08.19 |
申请人 |
KEUFFEL & ESSER COMPANY |
发明人 |
KEUFFEL CARL W. |
分类号 |
B43L13/06 |
主分类号 |
B43L13/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|
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