Not to be confused with the IS-4 Jastrząb from Instytut Szybownictwa in Poland.The IS-4 was a high performance glider designed by Iosif Şilimon and built in Romania in the late 1950s at the URMV-3 (Rom: Uzinele de Reparatii Material Volant-3 – Glider repair and manufacture factory) factory at Braşov.
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