Not only did the Dodgers feature the first African-American position player to play in the Majors, but they also introduced the first African-American pitcher to enter a Major League game. Featured above is a vintage AP Wire Photo, currently available for sale at RMY Auctions (Link Here), that shows a clapping Jackie Robinson (on the right) providing on-field encouragement to trailblazing pitcher Dan Bankhead as he enters a MLB game for the first time. It is dated to August 26, 1947.
As you may know, his debut did not go exactly as planned. Bankhead would enter the game in relief of starter Hal Gregg -- who had been shelled for six runs in the one inning he pitched (after not getting an out in the second inning) against the Pirates at Ebbets Field.