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发明名称
Cutting method and apparatus
摘要
申请公布号
US2758543(A)
申请公布日期
1956.08.14
申请号
US19500154925
申请日期
1950.04.10
申请人
GRANDIN CLARENCE W
发明人
GRANDIN CLARENCE W.
分类号
E21B29/02;E21B29/06;F42B3/08
主分类号
E21B29/02
代理机构
代理人
主权项
地址
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