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In 1950, the cleaning technology division was established with the development of the first European hot water high-pressure cleaner, the DS 350. [11] From the mid-1950s to the 1970s, the production of steam generators for industry and construction was a key focus for the company, while cleaning technology only later became Kärcher's main revenue-generating sector.
In 1961, the company name changed to Bergius-Kelvin Co. Ltd. and, in 1963, Gleniffer Engines was acquired by the company. Bergius-Kelvin was purchased by Ruston & Hornsby in 1966, who in turn were acquired by English Electric. The merger of English Electric with GEC, in 1968, led to yet another change of ownership. GEC consolidated all ...
K4, a four-man sprint kayak; K4, a model of the British red telephone box; K4, a normal modal logic; K 4, in graph theory, the complete graph of four vertices; K 4, in abstract algebra, the Klein four-group; K4 (mountain) or Gasherbrum II, a mountain between China and Pakistan; Kawai K4, a digital synthesizer