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经营范围
发明名称
Grade crossing guard
摘要
申请公布号
US2255911(A)
申请公布日期
1941.09.16
申请号
US19380205529
申请日期
1938.05.02
申请人
BURNISON GEORGE C
发明人
BURNISON GEORGE C.
分类号
B61L29/02
主分类号
B61L29/02
代理机构
代理人
主权项
地址
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