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Keywords from Image Description:
Walter Gemma I. en Czechoslovakian Walter Gemma radial engine used in Letov Smolik trainers SM only hp kg photographed in Finnish Aviation Museum fi Tekkoslovakialainen Walter Gemma thtimoottori kytetty Letov Smolik harjoituskoneissa numeroissa SM hv kg kuvattu Suomen ilmailumuseossa own MKFI region FI Letov Walter