Have you heard of Hank Mann (1887 - 1971)? He made over 400 movies, from 1912 to 1959.
I may assume that some of my readers are young, say under 40, and may not be familiar with silent films. Some may have never even seen a silent. If you haven't, you are missing a lot and should seek some out.
Hank Mann made about 200 silent films, roughly half of his work. Well over 60 were with Mack Sennett (1880 - 1960). 24 were with Mabel Normand (1895 - 1930), 26 with Roscoe "Fatty" Arbuckle (1887 - 1933), and 14 with Charlie Chaplin (1889 - 1977). He is one of the original Keystone Kops, and someone on Wikipedia credits him with the idea.
Mann played a prizefighter in Chaplin's last silent film, City Lights (1930). He had already made several talkies by then. He also appears in Modern Times (1936) and The Great Dictator (1940).
He made four films with Abbott and Costello, seven with Jerry Lewis, two with Bob Hope, and five with James Cagney.
Hank Mann is another great Bit Actor who helped make the movies what they are today.