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device for the production and transmission of occasional or periodic benoetigtentonfrequenten wechselstroemen different frequencies of cables, in particular to the holdings of resonance power lines, institutions of all kinds, especially electrical nebenuhren
device for the production and transmission of occasional or periodic benoetigtentonfrequenten wechselstroemen different frequencies of cables, in particular to the holdings of resonance power lines, institutions of all kinds, especially electrical nebenuhren