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发明名称
Telephone or like system
摘要
申请公布号
US2350589(A)
申请公布日期
1944.06.06
申请号
US19410411288
申请日期
1941.09.18
申请人
SIEMENS BROTHERS & CO. LIMITED
发明人
CHRISTIAN DAVID ADAM;CLAY DAVID LANGSFORD
分类号
B01D46/04;H04Q1/32
主分类号
B01D46/04
代理机构
代理人
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地址
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