发明名称 |
|
摘要 |
|
申请公布号 |
LU42923(A1) |
申请公布日期 |
1963.02.22 |
申请号 |
LUD42923 |
申请日期 |
1962.12.22 |
申请人 |
|
发明人 |
|
分类号 |
E21C27/12 |
主分类号 |
E21C27/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|
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