Milestones 2001 Commenced activities in the comfort ventilation area. Renamed the holding company Zehnder Group AG The 1990s Expansion of the radiator business in geographic and product terms and sale of all non-radiator activities. Development of radiator sales 1993 Hans-Peter Zehnder (4th generation) appointed chairman of the executive committee. 1986 Zehnder Holding AG went public; the new shares were placed on the market. 1984 Zehnder Holding AG established (all companies subject to the same management). 1975 Haenni Group (measuring instruments) taken over to reduce strong dependence on the construction sector. 1973/74 Radiator sales fell as a result of the recession in the construction market (triggered by the oil price shock). 1972 Commenced production of radiators in France. 1964 Built up its first foreign manufacturing company for the sale of radiators abroad (southern Germany). 1959 The third generation of the Zehnder family took over the management of the company. 1930 Commenced production of tubular steel radiators. 1930 Financial difficulties of the limited company J. Zehnder & Söhne. The Zehnder brothers were forced to resign from all their offices. 1923 Commenced production of motorcycles. 1895 Jakob Zehnder (born 1855) set up a mechanical workshop in Gränichen, Switzerland.