About Demco

Demco's history begins with Robert Dethmers, who started as a blacksmith and later ran an Allis Chalmers dealership with his father. In 1958, he sold the business and shifted to building agricultural equipment. By 1964, he founded Dethmers Manufacturing Company (Demco). After his passing in 1974, Jim Koerselman and Ken Mulder took over ownership. In the 1980s, during the Farm Crisis, Demco diversified by creating the Kar Kaddy, which saved the company. Over the years, Demco expanded further by acquiring companies like Maurer Manufacturing and adding new products, including 5th-wheel hitches and braking systems.

Today, Demco remains family-owned and is led by Bob Koerselman, Kevin Ten Haken, and James Koerselman. They continue to uphold the company’s values, focusing on innovation, relationships, and community. Demco recently renovated its original location in Boyden to include a Heritage Center that showcases its 60-year history and a training facility called DEPOT.