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发明名称
METHOD OF MAKING GRAVEL FILTER PIPES
摘要
申请公布号
US3467740(A)
申请公布日期
1969.09.16
申请号
USD3467740
申请日期
1966.11.21
申请人
JOSEF BOLEWSKI
发明人
JOSEF BOLEWSKI
分类号
B01D39/20;B28B21/56;B28B21/88;(IPC1-7):B28B7/32
主分类号
B01D39/20
代理机构
代理人
主权项
地址
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