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发明名称
ROTARY EXCAVATOR WITH ANTIITWISTING MECHANISM AND UNIVERSAL JOINT FOR VACUUM PIPE
摘要
申请公布号
JPS55148890(A)
申请公布日期
1980.11.19
申请号
JP19790056329
申请日期
1979.05.10
申请人
OKUCHI RIYOUYA
发明人
OKUCHI RIYOUYA
分类号
E21B21/02;E21B7/00;E21B21/00
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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