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发明名称
Method of making rifled extruded tubes
摘要
申请公布号
US2274550(A)
申请公布日期
1942.02.24
申请号
US19400345589
申请日期
1940.07.15
申请人
GENERAL MOTORS CORPORATION
发明人
KARMAZIN JOHN
分类号
B21C37/20;B21C37/24
主分类号
B21C37/20
代理机构
代理人
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