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经营范围
发明名称
Draft preventer
摘要
申请公布号
US2053793(A)
申请公布日期
1936.09.08
申请号
US19350033114
申请日期
1935.07.25
申请人
OLOF JOHNSON
发明人
JOHNSON OLOF
分类号
E06B7/20
主分类号
E06B7/20
代理机构
代理人
主权项
地址
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