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This was the first Austrian company to manufacture an airplane after the First World War; the Hopfner S.1 three seat monoplane. A developed version with Gipsy Major engine was designated HS-1033. Hopfner also produced the HA-1133 four-seat twin-engined amphibian before being taken over in 1935 by Hirtenberger Patronen, Zundhutchen und MetallwarenfabrikAG.


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