The Helios AG für elektrisches Licht und Telegraphenanlagenbau was a German electrical engineering company. Founded in 1882 it existed until its liquidation in 1930. The company was based in the town of Ehrenfeld, which was incorparted into Cologne in 1888. The company is nowadays mostly known for the Heliosturm, a lighthouse on the former site of the factory that was constructed for test and research purposes.
Helios-Lighthouse in Cologne-Ehrenfeld
Source:
http://en.wikipedia.org/wiki/Helios_AG
