KES6214579: A construction worker stands on a cement bucket on a crane rope on the construction site of the dam wall for the Mattenalpsee of KWO, Kraftwerke Oberhasli AG, in the Urbachtal, recorded in October 1949 (b/w photo) / Bridgeman Images

KES6214583: Construction worker in a transport cableway in the Urbachtal valley building the dam for the Mattenalpsee of KWO, Kraftwerke Oberhasli AG, taken in October 1949 (b/w photo) / Bridgeman Images

KES6214592: Chauffeur Hans Bodmer assembling the snow chains on his truck for the snow removal on the construction site of the dam of the Raeterichsbodensee of KWO, Kraftwerke Oberhasli AG, taken in December 1948 (b/w photo) / Bridgeman Images

KES6214691: The outdoor pool “Zwischen den Hoelzern” in Oberengstringen. The horticultural facilities of the outdoor pool opened two years ago are maintained by the company Spross Gartenbau. Taken on May 12, 1968 (b/w photo) / Bridgeman Images

KES6214692: The outdoor pool “Zwischen den Hoelzern” in Oberengstringen. The swimming pool of the outdoor pool, opened two years ago, is cleaned by two men using a pants. Taken on May 12, 1968 (b/w photo) / Bridgeman Images

KES6214708: Switzerland, Second Author Evening Of Atlantis Publisher 1941 (b/w photo) / Bridgeman Images

KES6216430: A visitor and a young visitor at the 12th Olma 1954 in St. Gallen watch a woodworker at work, taken in October 1954 (b/w photo) / Bridgeman Images

KES6216432: Federal Councillor Karl Kobelt, 2nd from right, and exhibition director and architect Erwin Schenker, right, at the opening of the 12th Olma 1954 in St. Gallen, taken in October 1954 (b/w photo) / Bridgeman Images

KES6216436: A young visitor steers a model railway at the 11th Olma 1953 in St. Gallen, recorded in October 1953 (b/w photo) / Bridgeman Images

KES6216440: The rod bundle from the cantonal coat of arms in the anniversary show '150 years canton St. Gallen 'at the 11th Olma 1953 in St. Gallen, recorded in October 1953 (b/w photo) / Bridgeman Images

KES6216441: A booth for canned rifles at the 11th Olma 1953 in St. Gallen, taken in October 1953 (b/w photo) / Bridgeman Images

KES6216444: Visitors at the demonstration of a knitting machine at the 11th Olma 1953 in St. Gallen, photographed in October 1953 (b/w photo) / Bridgeman Images

KES6216449: Federal Councillor Joseph Escher tasting cheese at the opening ceremony of the 10th Olma 1952 in St. Gallen, October 1952 (b/w photo) / Bridgeman Images

KES6216457: Speaker on the government podium at the Glarus Landsgemeinde in Glarus, taken on 9 May in the war year 1941 (b/w photo) / Bridgeman Images

KES6216461: View over the Ring at the Glarner Landsgemeinde on the Zaunplatz in Glarus, taken on 9 May in the war year 1941. In the haze the mountain scenery of Wiggis and Rautispitz (b/w photo) / Bridgeman Images

KES6216462: Men raise their hands at the vote at the Glarus Landsgemeinde on the Zaunplatz in Glarus, taken in early May 1936 (b/w photo) / Bridgeman Images

KES6216466: View over the assembled Glarner Landgemeinde on the Zaunplatz in Glarus, taken on May 10th in the war year 1942 (b/w photo) / Bridgeman Images

KES6216468: View from the window to the municipality of Glarus on the fence square in Glarus, taken on 9 May in the war year 1941 (b/w photo) / Bridgeman Images

KES6216474: Voting by raising hands at the Glarner Landsgemeinde on the Zaunplatz in Glarus, recorded in early May 1950 (b/w photo) / Bridgeman Images

KES6216479: View over the assembled Glarner Landgemeinde on the Zaunplatz in Glarus, taken at the beginning of May 1936 (b/w photo) / Bridgeman Images

KES6216481: Swing in at the Glarner Landsgemeinde in Glarus, taken on 1 May 1949 (b/w photo) / Bridgeman Images

KES6216490: Ota Sik signs his book “The third Way” in Basel on 18 October 1973 (b/w photo) / Bridgeman Images

KES6216499: Sennen during their activities in the procession to the Appenzeller Day of the 35th Olma 1977 in St. Gallen, recorded on October 15th 1977 (b/w photo) / Bridgeman Images

KES6216502: Federal Councillor Hans-Peter Tschudi cutting cheese at the opening of the 31st Olma 1973 in St. Gallen, recorded on 11 October 1973 (b/w photo) / Bridgeman Images

KES6216509: At the brown cattle auction at the 31st Olma 1973 in St. Gallen, traditional cows from the mountain regions are auctioned off, recorded on 18 October 1973 (b/w photo) / Bridgeman Images

KES6216512: At the brown cattle auction at the 31st Olma 1973 in St. Gallen, traditional cows from the mountain regions are auctioned off, recorded on 18 October 1973 (b/w photo) / Bridgeman Images

KES6216521: Federal Councillor Ernst Brugger, Mitte, during the tour of the opening of the 29th Olma 1971 in St. Gallen, taken in October 1971 (b/w photo) / Bridgeman Images

KES6216525: Federal Councillor Ludwig von Moos, Mitte, moving to the opening of the Olma 1968 in St. Gallen, taken on 10 October 1968 (b/w photo) / Bridgeman Images

KES6216228: Masked demonstrators flee on 31 May 1969 from police units at a demonstration against police and military in Bern, Switzerland, (b/w photo) / Bridgeman Images

KES6216233: On July 1, 1969, students symbolically occupy the deanery of the University of Bern, Switzerland. The background to the appointment is the demand of the students for a voice in the curriculum, which was rejected by the school management (b/w photo) / Bridgeman Images

KES6216234: On August 21, 1969, about 2500 people demonstrated in Bern, Switzerland, with a torchlight procession against the invasion of Czechoslovakia a year ago by troops of the Warsaw Pact under the leadership of the Soviet Union (b/w photo) / Bridgeman Images

KES6216260: From left to right: National Councillor Albin Breitenmoser, Trudi Gerster, Ruedi Walter, and Margrit Rainer at the planned 'Schwarzen-Bach-Ab' training course on May 30, 1970, a protest against the so-called Schwarzenbach Initiative (b/w photo) / Bridgeman Images

KES6216264: Supporters of the Olympics in the vote on 1/2 November advertise on the Pareadeplatz in Zurich, recorded on 31 October 1969 (b/w photo) / Bridgeman Images

KES6216272: Switzerland, Bern Demonstration Lenin Grader Processes 1970 (b/w photo) / Bridgeman Images

KES6216279: A member of the Swedish team, left, at the 4th International Flight Meeting at Duebendorf Airport on 23 July 1937 (b/w photo) / Bridgeman Images

KES6216290: The French squadron at the 4th International Flight Meeting at Duebendorf Airport in July 1937 (b/w photo) / Bridgeman Images