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H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
Einrichtung zum Betrieb von Wechselstrom-Kommutatormaschinen als Motoren, die mit Spannungsveränderung und gleichzeitiger Bürstenverschiebung geregelt werden.