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经营范围
发明名称
Sand riddle
摘要
申请公布号
US1746958(A)
申请公布日期
1930.02.11
申请号
US19270188218
申请日期
1927.05.02
申请人
THE NORTH AMERICAN MANUFACTURING COMPANY
发明人
NAAB GEORGE F.;WALTZ ALFRED B.
分类号
B22C5/06
主分类号
B22C5/06
代理机构
代理人
主权项
地址
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