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SCIENTIFIC EDUCATIONAL DEVICE FOR TEACHING WETTABILITY AND SUSPENDIBILITY

申请公布号:GB1246579(A)

申请号:GB19690062201

申请日期:1969.12.22

申请公布日期:1971.09.15

申请人:
JERRY NORMAN KORAL

发明人:JERRY NORMAN KORAL

分类号:G09B23/24

主分类号:G09B23/24

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