| 发明名称 |
Educational device |
| 摘要 |
|
| 申请公布号 |
US1791982(A) |
申请公布日期 |
1931.02.10 |
| 申请号 |
US19280251784 |
申请日期 |
1928.02.04 |
| 申请人 |
SMITH EDWARD R |
发明人 |
SMITH EDWARD R. |
| 分类号 |
G09B11/08;G09B13/00 |
主分类号 |
G09B11/08 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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