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发明名称
Thread protectors
摘要
申请公布号
US2747617(A)
申请公布日期
1956.05.29
申请号
US19530357864
申请日期
1953.05.27
申请人
JOHN WALDEN
发明人
WALDEN JOHN
分类号
B65D59/06;E21B17/00
主分类号
B65D59/06
代理机构
代理人
主权项
地址
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