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发明名称
Electronic keying means
摘要
申请公布号
US2483823(A)
申请公布日期
1949.10.04
申请号
US19470739852
申请日期
1947.04.07
申请人
GEORGE THOMAS J
发明人
GEORGE THOMAS J.
分类号
G10H1/057
主分类号
G10H1/057
代理机构
代理人
主权项
地址
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