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经营范围
发明名称
Ditching machine
摘要
申请公布号
US2885800(A)
申请公布日期
1959.05.12
申请号
US19540442719
申请日期
1954.07.12
申请人
THE NATIONAL RESEARCH DEVELOPMENT CORPORATION
发明人
HAWKINS JOHN CLEMENT
分类号
E02F3/20;E02F5/02;E02F5/08
主分类号
E02F3/20
代理机构
代理人
主权项
地址
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