发明名称 |
Elevator |
摘要 |
|
申请公布号 |
US2144072(A) |
申请公布日期 |
1939.01.17 |
申请号 |
US19360103176 |
申请日期 |
1936.09.29 |
申请人 |
BYRON JACKSON CO. |
发明人 |
LUNDEEN CHESTER ALBERT |
分类号 |
E21B19/07 |
主分类号 |
E21B19/07 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|
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