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发明名称
Method of forming detachable drill bit shanks
摘要
申请公布号
US2142239(A)
申请公布日期
1939.01.03
申请号
US19370165238
申请日期
1937.09.23
申请人
INTERNATIONAL DETACHABLE BITS & EQUIPMENT, LIMITED
发明人
COOK CHARLES EDWARD
分类号
B21K5/06
主分类号
B21K5/06
代理机构
代理人
主权项
地址
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