In April 1918, Holton opened a factory in Elkhorn, Wisconsin moving over 200 employees and 85 carloads of machinery from Chicago. The city had lured Holton to Elkhorn through the efforts of a group of local businessmen, who, acting under city mandate, built the new factory which was turned over to Holton and Co. upon their arrival. That building remained as the core of the Holton factory until the decision in 2008 to merge Holton horn production with King and Conn instruments in Eastlake, Ohio.