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crews pushing Indy race cars back into pit alley during delay at Indianapolis Motor Speedway / rain on racetrack / Indy race cars racing, one smoking / Lloyd Ruby racing Eagle Offenhauser #18 from pits and back into race / AJ Foyt racing Coyote Foyt #14, Johnny Rutherford racing Gulf sponsored McLaren Offenhauser #7 / electronic lap board with windsock atop tower / Mel Kenyon driving Eagle Foyt #19 from pits and back into race / Joe Leonard racing Samsonite sponsored Parnelli Offenhauser #1, David Hobbs racing Eagle Offenhauser #73 / Indy race cars driving from pits, reentering race / High angle cars parked in infield near electronic lap board topped by Sprite billboard, note the Indianapolis skyline in BG / Indy race cars including Mark Donohue driving Eagle Offenhauser #66, Graham McRae driving STP sponsored Eagle Offenhauser #60 from pits, reentering race. 1973 Indianapolis 500 on May 30, 1973 in Indianapolis, Indiana (Footage by Getty Images)