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发明名称
Swivel
摘要
申请公布号
US2507849(A)
申请公布日期
1950.05.16
申请号
US19460695241
申请日期
1946.09.06
申请人
BLAND JAY C
发明人
BLAND JAY C.
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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