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发明名称
Road form
摘要
申请公布号
US1755541(A)
申请公布日期
1930.04.22
申请号
US19270189542
申请日期
1927.05.07
申请人
HELTZEL JOHN N
发明人
HELTZEL JOHN N.
分类号
E01C19/50
主分类号
E01C19/50
代理机构
代理人
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