Kommutator für dynamoelektrische Maschinen

Abstract
Relates to dynamo-electric machines or motors; Improvements on devices to collect or communicate currents; Avoids destruction and wear of machine; Avoid adjustments due to destruction and wear; Enable practical construction of very large dynamo electric machines or motors with the minimum number of communicator segments; Increases safety and efficiency.
Patent #382845
Nikola Tesla
30.04.1887
15.05.1888