Sound recordings
| The following sound recordings are available for the period 1958 to 1960 | |||||
| Song about Klischograph | |||||
| 70th birthday of Dr. Hell (1971) | |||||
| Ceremonial act of 50 years anniversary of company Hell (1979) | |||||
| Awarding of the Siemens-Ring (1979) | |||||
| The following sound recordings are available for the period 1958 to 1960 | |||||
| Song about Klischograph | |||||
| 70th birthday of Dr. Hell (1971) | |||||
| Ceremonial act of 50 years anniversary of company Hell (1979) | |||||
| Awarding of the Siemens-Ring (1979) | |||||