| 1860 | Well-builder Christian Weiss founds company in Kulmbach |
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| 1866 | Construction of the first central water supply system in Kulmbach with wooden pipelines | |
1860-70 |
Construction of the cast iron pipe net in Kulmbach |  |
| 1895 | Enlarging the services portfolio by integrating construction of central heating systems |  |
| 1913 | Construction of a low-pressure-warm-water-heating system in the city hall of Kulmbacher | |
1957 |
Enlarging the product portfolio by integrating air-conditioning systems
|
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1964 |
Development and construction of Electric Storage Heating Systems | |
| 1978 | Construction of the first gas-heatpump in Germany in integration of this new product in the company product portfolio |  |
| 1980 | Foundation
of ASK
High Technology |
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| 1983 | Construction of new company HQ at "Am Goldenen Feld 27" |  |
| 1991 | Founding
of the subsidiary company GAWAB Gas - Wasser - Abwasser - Rohrleitungsbau GmbH in Saalfeld / Thuringia |
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