1939 | Werner Graf founds the “Dipl. Ing. Werner Graf” belt manufacturing company as a sole proprietorship in Zurich, Switzerland | |
1945 | Anton Graf, brother of Werner Graf, purchases real estate on Buechenstrasse in Staad. The property, a former ![]() |
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1952 | ![]() |
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1953 | Werner Graf purchases the property in Staad from his brother. | |
1962 | Construction of the western annexe, a production area for fabricating rubber coating and SOLUTUS belts. | |
1963 | Construction of the “Durisol” workshop for rubber compounding (later used as a grinding/processing shop). | |
1972 | Construction of the eastern annexe comprising a production hall for weaving mills and offices. | |
1977 | Death of Werner Graf, the company’s founder. | |
1978 | Company reformed as a limited company “Dipl.Ing. Werner Graf AG”, and acquired by co. Leder & CO. AG (today co. Ammeraal Beltech AG, Jona). | |
1979 | Appointment of Mr. Heinrich Sieber as Managing Director. | |
1988 | Sale of the company and transition to independence | |
1992 | Installation of an environmentally-friendly steam boiler with gas burner. | |
1994 | Installation of the long-desired goods and passenger lift. | |
1999 | Reconstruction of the vulcanisation building. | |
2000 | Heinrich Sieber retires. Edgar Seiz appointed new Managing Director. | |
2005 | Construction of new eastern annexe (two-floors) for grinding/processing and weaving mills. | |
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2008 | Installation of a sophisticated ventilation plant with process heat recovery | |
2009 | ![]() |
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2011 | ![]() |
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2013 | ![]() |
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2014 | ![]() |
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2017 | Trademark RONDLAST® high-performance round belts | |
2019 | ![]() |
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2020 | Apprenticeship for a Mediamatician EFZ started and Investment in a photovoltaic system and an electric car – for a more carbon neutral production |

Mr. Heinrich Sieber
Managing Director
1979-2000

Mr. Edgar Seiz
Managing Director
since 2000