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发明名称
Proportional resistance spring structure
摘要
申请公布号
US2137298(A)
申请公布日期
1938.11.22
申请号
US19370167951
申请日期
1937.10.08
申请人
TRENTON SPRING PRODUCTS COMPANY
发明人
MCCOY CHARLES F.
分类号
A47C23/053
主分类号
A47C23/053
代理机构
代理人
主权项
地址
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