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申请公布号
DE2154817(A1)
申请公布日期
1972.08.31
申请号
DE19712154817
申请日期
1971.11.04
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发明人
分类号
A01C9/00;A01C9/08;(IPC1-7):A01C9/00
主分类号
A01C9/00
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