John F. Corl Piano Company
The John F. Corl Piano Company was a maker of pianos in Michigan. They appear to have been in business during the years 1908 through 1927. Their main office appears to have been in Battle Creek, MI and they apparently had another office in Jackson, MI.
One piano restoration company describes them thusly: "Corl was a piano company that built no more than 200 pianos a year in a time when other manufacturers built thousands".