Most famous of all Austrian aircraft companies, Hirtenberger Patronen Zündhutchen und Metallwarenfabrik AG formed by rename of bankrupt Hopfner 1935. Herr Hopfner was appointed director, and obtained licence to build Fw Stieglitz. Original designs led to 13 prototypes, often with military and civil versions of same basic type, including low-wing and high-wing transports, light aircraft and amphibians. One design, HS.9 tandem-seat parasol trainer/tourer, was produced in small series (about 40).

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