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经营范围
发明名称
Ring traveler
摘要
申请公布号
US2121647(A)
申请公布日期
1938.06.21
申请号
US19370172132
申请日期
1937.11.01
申请人
WENTWORTH PHILIP C
发明人
WENTWORTH PHILIP C.
分类号
D01H7/60
主分类号
D01H7/60
代理机构
代理人
主权项
地址
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