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VOLTAGE REGULATOR CIRCUITAL ARRANGEMENT TO A D.C. SUPPLY SOURCE OPERATED FROM SINGLE- OR POLYPHASE MAINS AND CONSTRUCTED WITH A VALVE ACTION SEMICONDUCTOR DEVICE PROVIDED WITH CONTROL ELECTRODE
VOLTAGE REGULATOR CIRCUITAL ARRANGEMENT TO A D.C. SUPPLY SOURCE OPERATED FROM SINGLE- OR POLYPHASE MAINS AND CONSTRUCTED WITH A VALVE ACTION SEMICONDUCTOR DEVICE PROVIDED WITH CONTROL ELECTRODE