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Apparatur und verfahren zur messung des spulenwiderstandes und des kontaktwiderstandes zwischen der spule und den kollektorlamellen bei elektrischen motoren.
Verfahren und vorrichtung zur beeinflussung des elektrischen stromes im fluessigen aluminium bei der gewinnung von aluminium durch schmelzfluss- elektrolyse von aluminiumoxyd
Electrical current measurement and rapidly locating and positively identifying cathodes having abnormal electrical conditions associated therewith in an electrolytic copper refining process tankhouse