| 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  bell foundry (1874-1940), housed a paint and dye factory from 1940-1953. |
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| 1952 | Registration of the trademark HEVALOID®. |
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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 | Demolition of the “Durisol” workshop and 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 | 70-year company anniversary |
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| 2011 | Opening of new cafeteria/classroom |
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| 2013 | 25-year anniversary «Independency Graf» |
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| 2014 | 75-year company anniversary
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| 2017 | Trademark RONDLAST® high-performance round belts |
Mr. Werner Graf
Founder
1939-1977
Trademark
HEVALOID®
Mr. Heinrich Sieber
Managing Director
1979-2000
Mr. Edgar Seiz
Managing Director
since 2000
