The abbreviation trafo is used frequently as jargon in Central and Eastern Europe, for instance in Germany3), Poland, Russia, etc., especially in languages in which the word is even longer: transformator (rather than transformer as in English).4)
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There are many transformer-related companies world-wide, who have the word “trafo” in their name: General Trafo (Hungary)6), Trafomec Group (Italy)7), Poltrafo Sp. z o.o. (Poland)8), Trafo Power & Electricals Pvt. Ltd. (India)9), and many more.