The Grinnell Mutual Reinsurance Co. on Monday dedicated a new 33,000-square-foot conference center with a 250-seat auditorium, nine multipurpose meeting rooms, a video conferencing room, dining services and reception areas. Using the latest technology, the center provides onsite training and event space for the company’s employees and customers. The Bartelt Conference and Education Center is named for Dale Bartelt, chairman of Grinnell Mutual’s board of directors, who has been associated with the company for 45 years. Grinnell Mutual is the 120th-largest property-casualty insurance company in the United States and the largest primary reinsurer of farm mutual companies in North America.