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发明名称
Core drill
摘要
申请公布号
US2189057(A)
申请公布日期
1940.02.06
申请号
US19370179329
申请日期
1937.12.11
申请人
COPELIN LEONARD S
发明人
COPELIN LEONARD S.
分类号
E21B10/64;E21B25/02
主分类号
E21B10/64
代理机构
代理人
主权项
地址
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THERMOSTATIC SWITCH
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