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发明名称
Railroad gate
摘要
申请公布号
US1812866(A)
申请公布日期
1931.07.07
申请号
US19280266348
申请日期
1928.03.31
申请人
ARTHUR DROUIN JOSEPH
发明人
DROUIN JOSEPH ARTHUR
分类号
B61L29/02
主分类号
B61L29/02
代理机构
代理人
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