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发明名称
Gradometer
摘要
申请公布号
US2304625(A)
申请公布日期
1942.12.08
申请号
US19410406699
申请日期
1941.08.13
申请人
CARLSON FREDERICK O
发明人
CARLSON FREDERICK O.
分类号
G01C9/04
主分类号
G01C9/04
代理机构
代理人
主权项
地址
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