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经营范围
发明名称
Device for automatically opening and closing a door
摘要
A device for automatically opening and closing a door by turning the door through an angle of 90 DEG from an open to a closed position and vice versa.
申请公布号
US4924626(A)
申请公布日期
1990.05.15
申请号
US19890321010
申请日期
1989.03.09
申请人
TS'AO, SI-LING
发明人
TS'AO, SI-LING
分类号
E05F15/12
主分类号
E05F15/12
代理机构
代理人
主权项
地址
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