Improvements in the system of signalling and remote control by means of high frequency currents superimposed on distribution networks of electrical energy
摘要
申请公布号
GB444556(A)
申请公布日期
1936.03.18
申请号
GB19340018032
申请日期
1934.06.18
申请人
COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ
