- On 19 December Rudolf Hell is born in Eggmühl (Bavaria)1919
- Studied electrical engineering at the Technical University in Munich1923-1929
- Assistant with Prof. Dr. Max Dieckmann, Munich
- First marriage with Ms. Martha
- Founding of his own company in Neubabelsberg near Berlin1947
- Foundation of the company in Kiel - Dietrichsdorf
- Second marriage with Ms. Jutta.
- Dr. Hell retires from active management and becomes a member of the Supervisory
Board as chairman1989
- Dr. Hell withdrew from active business life.
- On the 19th of December, Dr.-Ing. Rudolf Hell celebrates his 100th birthday
Ceremony within the town hall of Kiel; Laudation (German) held by Mr. B. Fuchs
- The "Siemenswall" -road to the Heidelberg plant in Kiel-Suchsdorf- is renamed into
- On March 11 Dr.-Ing. Rudolf Hell passed away in Kiel.
The funeral takes place in an honorary ceremony of the City of Kiel in the