My fourth son gave me a John Mayall with Eric Clapton CD which has been quite enjoyable. On the track "What'd I Say?" ("Gonna send ya back to Arkansas," that one.) there is unmistakably the bass line from the Beatles "Day Tripper." I don't know who stole it from whom, or whether it was a standard riff at the time that both happened to use. But there it was.
I don't think of the Beatles as a blues outfit. It's members started in skiffle bands, and once I considered it, I recognised that a lot of their earliest stuff was bluesy. Not that many songs were standard 12-bar blues, but it's clearly there once you look for it. From memory
Don't Let Me Down
Roll Over Beethoven
I Saw Her Standing There
Back In The USSR
Can't Buy Me Love
Can anyone think of (or research) others?