all planes 
SZD-21
W.W.S.1 Salamandra · Alan Wilson from Stilton, Peterborough, Cambs, UK· CC BY-SA 2.0
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SZD-21
Szybowcowy Zakład Doświadczalny
🇵🇱 Poland ·5 types· first flights 1936–1976· 891 built
Sorted by number built. Sources: Wikidata, Wikipedia.. Photos from Wikimedia Commons. All makers.