By 1939, the year war broke out in Europe, a shortage of gasoline sent auto makers looking for alternative fuel sources for autos. Oil from the Middle East was soon to be cut off as the Germans controlled the Mediterranean and sunk shipping in the Atlantic.
Volvo developed a natural gas conversion unit. Gas trailers and special gas tanks were developed as add-ons to existing cars, but car sales started dipping once more as war spread.
While Sweden remained neutral during World War II, Volvo turned i
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