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发明名称
Declivity level
摘要
申请公布号
US2786279(A)
申请公布日期
1957.03.26
申请号
US19560592931
申请日期
1956.06.21
申请人
HUGHES GEORGE W
发明人
HUGHES GEORGE W.
分类号
G01C9/12
主分类号
G01C9/12
代理机构
代理人
主权项
地址
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