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发明名称
URBAN TYPE EARTH POLE INSTALLING METHOD
摘要
申请公布号
JPH02252888(A)
申请公布日期
1990.10.11
申请号
JP19890073900
申请日期
1989.03.28
申请人
WATANABE TSUGUHIKO;GENMA SATOSHI
发明人
WATANABE TSUGUHIKO
分类号
E21B11/00;E21B7/00;H01R4/66
主分类号
E21B11/00
代理机构
代理人
主权项
地址
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