| 发明名称 |
Extension ladder |
| 摘要 |
|
| 申请公布号 |
US2636659(A) |
申请公布日期 |
1953.04.28 |
| 申请号 |
US19490087716 |
申请日期 |
1949.04.15 |
| 申请人 |
HELEN SALISBURY NIXON |
发明人 |
SALISBURY RAYMOND R. |
| 分类号 |
E06C1/22 |
主分类号 |
E06C1/22 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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