1925 | Company founded by Hermann Ruf
– Sale of electrical equipment for industrial needs and for trams
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1939 | Collaboration with Wilhelm Hessen and extension of the range to switchgear, electrical installations and fastening fixtures |
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1948 | Manufacture of fittings for overhead lines |
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1952 | Change of location, Mannheim, move to Voltastraße 19–21 |
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1965 | Manufacture and sale of level measuring systems |
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1970 | Founding of Hermann Ruf GmbH & Co. KG, joint partners Herbert Ruf and Philipp Schadt |
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1988 | Splitting off of Elektrohandel Ruf |
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1991 | Takeover of Hermann Ruf GmbH & Co. KG by Pepperl & Fuchs GmbH |
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1996 | Company split; the level measuring systems operations are integrated into Pepperl & Fuchs GmbH; founding of ESN Bahngeräte GmbH |
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2000 | ESN Bahngeräte GmbH is taken over 50% by each of the brothers Hans and Stefan Zayer |
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2008
| Introduction of SMD technology into manufacturing
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2009
| Move within Mannheim to Cochemer Straße 12-14
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