It's amazing what you can find with correct infomation. They are still around.
From their website:
History
Two Hammers, Horse & Buggy Hardware in the Beginning . . .
Canton Drop Forge was founded in 1903. Consisting of one 50’x100’ building and two hammers, the very first plant opened in Canton, Ohio. Early markets were railroad tools, horse and buggy hardware and automobile parts. Over the next two years the company came into the principal ownership of Charles A. Brauchler. By 1909, Canton Drop Forge had grown to six hammers and commissioned the construction of a new machine shop.
New Patents Secured, Forgings Go To War . . .
In the twenties, CDF became a major producer of parts for the undercarriage of passenger railcars. Mr. Brauchler acquired patents for his designs of these unique parts, which are still being forged today. In 1942, the Defense Department built a new plant for the production of forgings to support the war effort. CDF operated the facility, making parts for aircraft and land based fighting equipment, and officially purchased the plant from the U.S. Government in 1951.