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发明名称
Safety zone guard
摘要
申请公布号
US1959568(A)
申请公布日期
1934.05.22
申请号
US19310582364
申请日期
1931.12.14
申请人
RICHARD CALLAGHAN
发明人
CALLAGHAN RICHARD
分类号
E01F9/087;E01F15/14
主分类号
E01F9/087
代理机构
代理人
主权项
地址
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