Kass 1911 Ery I
![]() Józef Kass of Warszawa built in France a "self-stable" monoplane, the Kass Ery I, though there are no conclusive information about its flights;
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Kass 1911 Ery I
![]() Józef Kass of Warszawa built in France a "self-stable" monoplane, the Kass Ery I, though there are no conclusive information about its flights;
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