H. Olszański writes in his book Tradycyjne olejarstwo w Polsce (‘Traditional oil-milling in Poland’) that, as technological thinking progressed in the nineteenth century, traditional appliances for oil milling such as querns, mortars or wedge presses were replaced by heating systems with stirrers, appliances with several rollers for flaking the seeds and lever presses, and later hydraulic presses driven by thread-mills, then by steam engines, motor engines and more recently by electric engines.
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