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Wiki information Singstad:
Ole Knutsen Singstad was a Norwegian-American civil engineer who innovated the ventilation system for the Holland Tunnel and advanced the use of the "Sunk-tube" method of underwater vehicular tunnel building, a system of constructing the tunnels with...
Karin Singstad is a Norwegian team handball player and Olympic medalist. She received a silver medal at the 1988 Summer Olympics in Seoul with the Norwegian national team.