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发明名称
Spring device
摘要
申请公布号
US1805600(A)
申请公布日期
1931.05.19
申请号
US19290358545
申请日期
1929.04.27
申请人
ROSS CHARLES L
发明人
ROSS CHARLES L.
分类号
F41A3/78
主分类号
F41A3/78
代理机构
代理人
主权项
地址
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