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经营范围
发明名称
Grave digger and excavator
摘要
申请公布号
US2197989(A)
申请公布日期
1940.04.23
申请号
US19390277419
申请日期
1939.06.05
申请人
DEAN TYLER EDITH;KNOX GEORGE A
发明人
TYLER EDITH DEAN;KNOX GEORGE A.
分类号
E02F5/20;E21B7/00
主分类号
E02F5/20
代理机构
代理人
主权项
地址
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