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经营范围
发明名称
Yielding barrier
摘要
申请公布号
US2397330(A)
申请公布日期
1946.03.26
申请号
US19430488777
申请日期
1943.05.27
申请人
SAWYER EMERSON D
发明人
SAWYER EMERSON D.
分类号
E01F13/04
主分类号
E01F13/04
代理机构
代理人
主权项
地址
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