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摘要
申请公布号
US1824598(A)
申请公布日期
1931.09.22
申请号
US19280294861
申请日期
1928.07.23
申请人
HOLDER EDWARD P
发明人
HOLDER EDWARD P.
分类号
G01J3/52
主分类号
G01J3/52
代理机构
代理人
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