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发明名称
Method of casting tetrahedrons
摘要
申请公布号
US1875668(A)
申请公布日期
1932.09.06
申请号
US19310542826
申请日期
1931.06.08
申请人
SHELDON DANIEL F
发明人
SHELDON DANIEL F.
分类号
E02B3/12
主分类号
E02B3/12
代理机构
代理人
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