Fatal crash of Polish rider Zbigniew Raniszewski, April 21, 1956 in Vienna.
From motorsportmemorial.org:
"Polish rider Zbigniew Raniszewski of the Gwardia Bydgoszcz team, died in a speedway accident in Wien, Austria, when his bike tangled with a competitor and he lost control, running headfirst into the underside of a flight of stairs."
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