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Professor Proton | The Big Bang Theory Wiki | Fandom
Bob Newhart, aka 'Professor Proton,' bids farewell to 'Big Bang Theory'
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Professor Proton | The Big Bang Theory Wiki | Fandom
Professor Proton | The Big Bang Theory Wiki | Fandom
Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
The Big Bang Theory (TV Series 2007–2019) - “Cast” credits - IMDb
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Bob Newhart - Wikipedia
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Big Bang Theory': Bob Newhart Returning in Final Season 12 as Proton | TVLine
Bob Newhart - IMDb
The Big Bang Theory - Rotten Tomatoes
Bob Newhart on His 'Big Bang Theory' Gig: 'It's Like Going Back in Time' – The Hollywood Reporter
