John F. Hamilton & Co., from Maple Lake Minnesota, registered a Trademark for a "Remedy for Dandruff" in 1902 (TM #38,547). The firm consisted of John F. Hamilton, Frank W. Enghouser, and Martin O. Laughlin. They said they had just started selling the brand the same year. The Trademark was a portrait drawing of John F. Hamilton, with his signature across it. Bottle description courtesy of Fike.