Messe Düsseldorf, a trade fair ground and organizer, agreed to acquire a 60% stake in XPONENTIAL, a developer of automated systems platform. Financial terms were not disclosed. "With this strategic investment, we are underlining the demands we put on ourselves to further develop our portfolio in the interests of our customers and to enter promising markets of the future," Wolfram N. Diener, Messe Düsseldorf President and CEO.