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发明名称
Art of examining quartz
摘要
申请公布号
US2264380(A)
申请公布日期
1941.12.02
申请号
US19400348603
申请日期
1940.07.30
申请人
RADIO CORPORATION OF AMERICA
发明人
HAWK HENRY W. N.
分类号
主分类号
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