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发明名称
Door or gate closer
摘要
申请公布号
US1804385(A)
申请公布日期
1931.05.05
申请号
US19290391866
申请日期
1929.09.11
申请人
FERRIN ARTHUR M
发明人
FERRIN ARTHUR M.
分类号
E05F1/10
主分类号
E05F1/10
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代理人
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