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发明名称
Method of making columnar structures
摘要
申请公布号
US1998367(A)
申请公布日期
1935.04.16
申请号
US19330672976
申请日期
1933.05.26
申请人
FRANK HAMMEL VICTOR
发明人
HAMMEL VICTOR FRANK
分类号
E04H12/10
主分类号
E04H12/10
代理机构
代理人
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