At the Paris World Exhibition in 1925, he exhibited furniture designed by the architect Kaj Gottlob, earning himself an honorary award.
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Born in Sønder Bjert near Kolding in the south of Jutland, Iversen first worked as a fisherman like his father.
At present nine main pollen zones, I-IX, are defined, based on the work of J. Iversen, published in 1954.