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The Albatros D.IV was an experimental German fighter aircraft built and tested during World War I.
The Alter A.1 was a single-seat biplane fighter aircraft first flown in February 1917. Built by Ludwig Alter-Werke of Darmstadt to a design by Kallweit and Ketterer, the A.1 was very similar in concept to the Nieuport 11, but not an exact copy.
