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发明名称
Gauge
摘要
申请公布号
US2242131(A)
申请公布日期
1941.05.13
申请号
US19390302418
申请日期
1939.11.01
申请人
JOHNSON IRA P
发明人
JOHNSON IRA P.
分类号
E01B35/00
主分类号
E01B35/00
代理机构
代理人
主权项
地址
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