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经营范围
发明名称
Switch-operated frog
摘要
申请公布号
US1785895(A)
申请公布日期
1930.12.23
申请号
US19300431519
申请日期
1930.02.26
申请人
ENGLAND WILLIAM A
发明人
ENGLAND WILLIAM A.
分类号
E01B7/14
主分类号
E01B7/14
代理机构
代理人
主权项
地址
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