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发明名称
Improvements in or relating to the generation of pulsating electric currents
摘要
申请公布号
GB351549(A)
申请公布日期
1931.06.29
申请号
GB19300009848
申请日期
1930.03.27
申请人
AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;AUSTIN HUGH WILLIAMS
发明人
分类号
H04M19/02
主分类号
H04M19/02
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代理人
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