Transformer invented 75 years ago

@article{Halacsy1961TransformerI7,
  title={Transformer invented 75 years ago},
  author={A. Halacsy and G. H. von Fuchs},
  journal={Electrical Engineering},
  year={1961},
  volume={80},
  pages={404-407}
}
Last year marked the 75th anniversary of the first commercial installation of the transformer. In this article a brief history of the) early days of the transformer's development is presented. 
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Die Geschichte des Transformators