| 发明名称 |
Navigation device |
| 摘要 |
|
| 申请公布号 |
US2420673(A) |
申请公布日期 |
1947.05.20 |
| 申请号 |
US19450583819 |
申请日期 |
1945.03.20 |
| 申请人 |
ERIC S. MAGNUS |
发明人 |
MONRAD ROBERT T. |
| 分类号 |
G01C21/20 |
主分类号 |
G01C21/20 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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