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发明名称
Drilling machine
摘要
申请公布号
US1833834(A)
申请公布日期
1931.11.24
申请号
US19290342445
申请日期
1929.02.25
申请人
HARDSOCG MANUFACTURING CO.
发明人
HARDSOCG LESTER C.
分类号
B25D17/30;E21B7/02
主分类号
B25D17/30
代理机构
代理人
主权项
地址
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