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发明名称
Signal device
摘要
申请公布号
US2220979(A)
申请公布日期
1940.11.12
申请号
US19380245407
申请日期
1938.12.13
申请人
SWANSON FRANK A
发明人
SWANSON FRANK A.
分类号
G10K1/064
主分类号
G10K1/064
代理机构
代理人
主权项
地址
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