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发明名称
Railway switch stand
摘要
申请公布号
US1814306(A)
申请公布日期
1931.07.14
申请号
US19290377841
申请日期
1929.07.12
申请人
THE AMERICAN VALVE AND METER COMPANY
发明人
GRAY WALLACE M.
分类号
B61L5/02
主分类号
B61L5/02
代理机构
代理人
主权项
地址
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