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发明名称
Improvements relating to automatic and semi-automatic telephone systems and the like
摘要
申请公布号
GB378585(A)
申请公布日期
1932.08.18
申请号
GB19310017232
申请日期
1931.06.13
申请人
SIEMENS BROTHERS & CO., LIMITED;WILLIAM GEORGE PATTERSON;DAVID ADAM CHRISTIAN;WILLIAM HERBERT GRINSTED
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
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代理人
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