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经营范围
发明名称
Rapid excavation machine
摘要
申请公布号
US2621816(A)
申请公布日期
1952.12.16
申请号
US19510240701
申请日期
1951.08.07
申请人
THEODORE ALLARD PIERRE JEAN MA
发明人
ALLARD PIERRE JEAN MARIE THEODORE
分类号
E21B7/02;E21B27/00
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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