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发明名称
Curbing
摘要
申请公布号
US1927388(A)
申请公布日期
1933.09.19
申请号
US19310522198
申请日期
1931.03.13
申请人
ROBERT CAMPBELL JOHN
发明人
CAMPBELL JOHN ROBERT
分类号
E01C11/22
主分类号
E01C11/22
代理机构
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