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发明名称
SHEET METAL RAILWAY GRADE CROSSING
摘要
申请公布号
CA329494(A)
申请公布日期
1933.01.17
申请号
CAD329494
申请日期
申请人
THE A. O. SMITH CORPORATION
发明人
RAYMOND T. BELL
分类号
主分类号
代理机构
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