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发明名称
Straightedge
摘要
申请公布号
US1753414(A)
申请公布日期
1930.04.08
申请号
US19250049998
申请日期
1925.08.13
申请人
WILLIAM HELTZEL JOSEPH
发明人
HELTZEL JOSEPH WILLIAM
分类号
E01C19/44
主分类号
E01C19/44
代理机构
代理人
主权项
地址
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