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经营范围
发明名称
Safety marker
摘要
申请公布号
US2229179(A)
申请公布日期
1941.01.21
申请号
US19380183452
申请日期
1938.01.05
申请人
LANGDON JESSE D
发明人
LANGDON JESSE D.
分类号
E01F9/07
主分类号
E01F9/07
代理机构
代理人
主权项
地址
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