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发明名称
Bridge and breaker
摘要
申请公布号
US1797138(A)
申请公布日期
1931.03.17
申请号
US19300475553
申请日期
1930.08.15
申请人
JOHN GOGOL
发明人
GOGOL JOHN
分类号
E01D19/02
主分类号
E01D19/02
代理机构
代理人
主权项
地址
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