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发明名称
Spring testing device
摘要
申请公布号
US1822587(A)
申请公布日期
1931.09.08
申请号
US19270174082
申请日期
1927.03.09
申请人
ESSEN ERIC E
发明人
ESSEN ERIC E.
分类号
G01N3/00
主分类号
G01N3/00
代理机构
代理人
主权项
地址
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