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3. United States Patent 5489187. IPC F04D 29/10. Published February 6, 1996.
4. Application 4229042, Federal Republic of Germany, IPC F04D 19/12. Published March 3, 1994.
5. “Umwalzpumpen mit integrieter Steuerung,” Schweir. Ing. und Archit., No. 43, B155–B156.