Activities in this discipline included the design of the 1947 Cona vacuum coffee maker ( produced from 1949, reworked in 1959 and still in production ) and inventions such as a circular vacuum cleaner and an early 1960s portable handheld duplicating machine by Gestetner, which was not put into production due to the demise of mimeography.
42.
Like the typewriter, these machines were products of the second phase of the industrial revolution which started near the end of the 19th century ( also called the Second Industrial Revolution ) This second phase brought to mass markets technologies like the small electric motors and the products of industrial chemistry without which the duplicating machines would not have been economical.
