Adolphe Kegresse was the inventor of the flexible "high speed" half track vehicle. A French engineer (later Andre Citroen's general manager at his armaments factory during WW1). He came up with a scheme to allow the Tsar to go driving in snowy conditions which translated into many variations including the American WW2 half track which had a Kegresse track system.
Citroen/Kegress half tracks made the first Sahara crossing, first Africa north to south and first Mediterranean to Pacific.
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