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发明名称
Drainage channel cleaner
摘要
申请公布号
US2136982(A)
申请公布日期
1938.11.15
申请号
US19370169887
申请日期
1937.10.19
申请人
PRATT CHARLES A
发明人
PRATT CHARLES A.
分类号
E02F5/28
主分类号
E02F5/28
代理机构
代理人
主权项
地址
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