KES6218636: Road construction in Val Bagnes for the construction site of the arch dam of the Mauvoisin power station in the canton of Valais, taken in May 1951 (b/w photo) / Bridgeman Images

KES6218643: The diesel central plant of the Elektrizitaetswerke Jona-Rapperswil AG in Rapperswil, taken on 4 January 1967 (b/w photo) / Bridgeman Images

KES6218646: The construction site of the Rhine power plant Rekingen in the canton of Aargau, taken on 20 January 1939 (b/w photo) / Bridgeman Images

KES6218647: The construction site of the Rupperswil-Auenstein hydroelectric power station on the River Aare in the canton of Aargau, recorded on 5 November 1943 (b/w photo) / Bridgeman Images

KES6218654: Firefighters fight the turbine fire at the Muehleberg nuclear power plant, taken on 29 July 1971, through the fragmented glass front of the nacelle (b/w photo) / Bridgeman Images

KES6218656: Switzerland, Thomas Mann 25Th Day Of Death (b/w photo) / Bridgeman Images

KES6218657: On the occasion of Thomas Mann's 100th birthday, Consul Sacher of the Federal Republic of Germany, left, has a wreath laid on the writer's grave. Taken on 5 June 1975 at the Kilchberg cemetery, Canton Zurich (b/w photo) / Bridgeman Images

KES6218664: The planned army auxiliary firing range below the Schiffenen power station in the canton of Fribourg is strongly protested by the population, recorded on 31 March 1979 (b/w photo) / Bridgeman Images

KES6218666: The shadow of the airplane from which an aerial photograph of the Schiffenen power station in the canton of Fribourg was taken in April 1970 (b/w photo) / Bridgeman Images

KES6218670: An aerial photograph of the Schiffenen power plant in the Canton of Fribourg, taken in April 1964 (b/w photo) / Bridgeman Images

KES6218671: The construction site of the power plant stage S-chanf-Pradella of the Engadine power plants, taken on 26 November 1968 (b/w photo) / Bridgeman Images

KES6218676: The Aare river power station Wildegg-Brugg in the canton of Aargau, recorded in September 1952 (b/w photo) / Bridgeman Images

KES6218677: The construction site of the dam of the Sanetsch power station in the canton of Valais, recorded in October 1962 (b/w photo) / Bridgeman Images

KES6218678: Visit of the Geltenbach valley for the planned Sanetsch power station with the municipal council of Lauenen and Bernese press in front of a signpost and the Dungelschuss, taken in August 1956 (b/w photo) / Bridgeman Images

KES6218682: The dam in the Schüssen, part of the Etzelwerk, which produces electricity for the SBB, Swiss Federal Railways from Lake Sihl, taken on 4 March 1967 (b/w photo) / Bridgeman Images

KES6218683: The inauguration of the Sanetsch power plant, here in the Maschinenhaus in Gsteig, Canton Bern, recorded on 23 September 1966 (b/w photo) / Bridgeman Images

KES6218685: The construction site of the dam of the Schiffenen power plant in the canton of Fribourg, photographed in May 1962 (b/w photo) / Bridgeman Images

KES6218691: The erection ceremony of the dam of the Schiffenen power station in the canton of Fribourg, recorded on 6 December 1962 (b/w photo) / Bridgeman Images

KES6218706: Switzerland, Zurich Milchbucktunnel (b/w photo) / Bridgeman Images

KES6218709: People are taking a siesta on the Pestalozziwiese in front of the Globus department store on Bahnhofstrasse in Zurich, recorded in July 1980 (b/w photo) / Bridgeman Images

KES6218710: Occupation of the construction site and the construction machinery for the demolition of the Gauger factory in Zurich, recorded on May 10, 1976 (b/w photo) / Bridgeman Images

KES6218712: The construction site for the second tube of the Ulmberg tunnel in Zurich, taken on 13 August 1965 (b/w photo) / Bridgeman Images

KES6218716: Women work at Photocolor Kreuzlingen AG in the canton of Thurgau on the printers, taken at the inauguration ceremony for the extension on 30 June 1970 (b/w photo) / Bridgeman Images

KES6218717: Switzerland, Zurich Milchbucktunnel (b/w photo) / Bridgeman Images

KES6218718: A woman works at Photocolor Kreuzlingen AG in the canton of Thurgau, taken on 30 June 1970 (b/w photo) / Bridgeman Images

KES6216544: In the outdoor area of the Olma 1970 in St. Gallen a small airplane is admired by the young visitors, taken in October 1970 (b/w photo) / Bridgeman Images

KES6216546: A woman is reading a newspaper at the Olma 1970 in St. Gallen, recorded in October 1970 (b/w photo) / Bridgeman Images

KES6216553: Traffic signs at the Olma 1970 in St. Gallen, taken in October 1970 (b/w photo) / Bridgeman Images

KES6216556: Visitors in the outdoor area of the Olma 1966 in St. Gallen, taken in October 1966 (b/w photo) / Bridgeman Images

KES6216562: Federal Councillor Rudolf Gnaegi, left, in the Olma stable at the opening of the Olma 1966 in St. Gallen, taken in October 1966 (b/w photo) / Bridgeman Images

KES6216565: From left to right: City President Anderegg, Bruno Meyer, Director of Olma, and Federal Councillor Rudolf Gnaegi tasting cheese at the opening of the Olma 1966 in St. Gallen, recorded in October 1966 (b/w photo) / Bridgeman Images

KES6216567: For the first time a livestock auction takes place at the Olma 1966 in St. Gallen, recorded in October 1966 (b/w photo) / Bridgeman Images

KES6216571: Visitors in the Olma stable at the 23rd OLMA in St. Gallen, taken in October 1965 (b/w photo) / Bridgeman Images

KES6216573: Federal Councillor Paul Chaudet and the cows in the Olma stable at the 23rd OLMA in St. Gallen, recorded in October 1965 (b/w photo) / Bridgeman Images

KES6216574: Visitors tasting cheese at the 23rd OLMA in St. Gallen, taken in October 1965 (b/w photo) / Bridgeman Images

KES6216578: Federal Councillor Roger Bonvin, center, degusted at the opening of the 21st OLMA in St. Gallen Kaese, recorded in October 1963 (b/w photo) / Bridgeman Images