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发明名称
Communicating device
摘要
申请公布号
US1831891(A)
申请公布日期
1931.11.17
申请号
US19290338440
申请日期
1929.02.08
申请人
STILLMAN RAY G
发明人
STILLMAN RAY G.
分类号
B61L7/08
主分类号
B61L7/08
代理机构
代理人
主权项
地址
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