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经营范围
发明名称
DECOMPRESSION MANHOLE
摘要
申请公布号
PL119707(B1)
申请公布日期
1982.01.30
申请号
PL19790213926
申请日期
1979.03.06
申请人
发明人
分类号
B63J2/10;F16K17/14;F17C13/12;(IPC1-7):63B19/12
主分类号
B63J2/10
代理机构
代理人
主权项
地址
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