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...tenmark, planned to take over the company but he died just after doing so. Ernst took over the business until his death in 1924. In 1926, the company converted to a limited company by Ernst's son Hugo. The company built a new factory in 1927 and survived through th

|Founder=Ernst Keller KESO began in the 1950s by Ernst Keller of Switzerland.<ref>[http://www.keso.com/Other/KESO/Downloads/Imageb