| 发明名称 |
Loud-speaker |
| 摘要 |
|
| 申请公布号 |
US1763053(A) |
申请公布日期 |
1930.06.10 |
| 申请号 |
US19270159553 |
申请日期 |
1927.01.07 |
| 申请人 |
TITANAFRAM CORPORATION |
发明人 |
HOPKINS MARCUS C. |
| 分类号 |
H04R7/12 |
主分类号 |
H04R7/12 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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