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Relay equipment, in particular light relay arrangement, with from the mains roehre anode a.c. voltage amplifier is supplied with sufficient vera, and, by means of a laboratory resistance element with rectifying effect a controlled in-phase grid alternating voltage
Relay equipment, in particular light relay arrangement, with from the mains roehre anode a.c. voltage amplifier is supplied with sufficient vera, and, by means of a laboratory resistance element with rectifying effect a controlled in-phase grid alternating voltage