Improvements in and relating to discharge relay and amplifying circuits or arrangements for amplifying or recording wireless signals or for other purposes
摘要
申请公布号
GB353438(A)
申请公布日期
1931.07.22
申请号
GB19300012488
申请日期
1930.04.22
申请人
WILLIAM BEVERIDGE MACKENZIE;HAROLD SMITH;ERNEST GEORGE HILL
