The Caille Bros. along with Mills Novelty Company, were one of the most successful companies in the United States coin-operated machine industry during the 19th century and early 20th century. They became popular releasing not only slot machines, but also strength testers and Bagatelle-style games. Once penny arcades began to decline and were largely replaced by nickelodeons, the company continued to release mainly trade simulators and gambling machines, with little variety in their mechanical game output and were overtaken by newer players such as A.B.T, Erie Machine co., Chester Pollard and Exhibit Supply.