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经营范围
发明名称
Spring structure
摘要
申请公布号
US1833532(A)
申请公布日期
1931.11.24
申请号
US19270201805
申请日期
1927.06.27
申请人
PROUTY WILLIS O
发明人
PROUTY WILLIS O.
分类号
A47C23/00
主分类号
A47C23/00
代理机构
代理人
主权项
地址
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