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发明名称
Improvements in or relating to hunting switches particularly for use in automatic orsemi-automatic telephone systems
摘要
申请公布号
GB356272(A)
申请公布日期
1931.09.07
申请号
GB19300017571
申请日期
1930.06.06
申请人
WILLIAM HATTON
发明人
分类号
H04M3/36
主分类号
H04M3/36
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代理人
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