This advertisement appeared in the Los Angeles Times on March 10, 1918,
and shows that Ollie Powers and Shelton Brooks were touring on the vaudeville circuit
already by 1918.
Many thanks to Bill Egan of Canberra, Australia, for providing this image!
Mr. Egan is responsible for the fine website dedicated to Florence Mills that I have linked to on the Ollie L. Powers title page on this site (hit Back to Ollie L. Powers, below).