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发明名称
PREVENTIVE DEVICE ESPECIALLY USED FOR ENTRANCE INTO MANHOLE
摘要
申请公布号
JPS54164341(A)
申请公布日期
1979.12.27
申请号
JP19780073497
申请日期
1978.06.17
申请人
NAKAO KAZUTOSHI
发明人
NAKAO KAZUTOSHI
分类号
E02D29/14;E02D29/12
主分类号
E02D29/14
代理机构
代理人
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