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发明名称
Grader
摘要
申请公布号
US1787295(A)
申请公布日期
1930.12.30
申请号
US19280321934
申请日期
1928.11.26
申请人
WARD WILLIS C
发明人
WARD WILLIS C.
分类号
E02F3/84
主分类号
E02F3/84
代理机构
代理人
主权项
地址
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