This will explain:
Székesfehervár Engine Repair Co. can be the 'airplane manufacturer' firm.
"In 1955 the Ministry comissioned three engineers: Ernô Rubik, the father of the inventor of the Rubik-cube, himself a very talented engineer, Pál Kerekes and Géza Bengyel to start the work on microcars at the Székesfehervári Motorjavˇt˘ V llalat (Székesfehervár Engine Repair Co. Székesfehervár is a city near the capital).
This firm repaired airplanes. Their employes were all gifted in their field. So when the airplane business would have to be shut down, they looked for new activities. They were good in aluminium so any kind of goods made from aluminium counted: from a parabolic antenna through cheese-tub to microcars. One of their engineers, József Horv th already played with the idea of building himself a car. So he brought his plans to the factory and there they started to build the car. József Zappel, another engineer also fancied the idea of a bubble-car so, he too, did some drafts. "
and
"The Úttörô [Pioneer] was one of the best publicised privately-built microcar. It was designed by János Schadek in Debrecen, east Hungary in 1954. He was a mechanical engineer. While studying at the University he built his first touring car between 1922 and 1927 and in 1930 a Morgan-like tricar. Then he took over the wire-making factory of his father-in-law. After the War he tried to avoid nationalization, but he couldn't and eventually all the small factories of Debrecen were united into the Locksmith and Iron-founder Company. Schadek became the chief engineer.
He decided to design a two-seater small car. He had some conversations with two locksmiths János Puskás and István Schwanner. Both of them had repaired and assembled airplanes previously. The three experienced men built the Úttörô from scratch. "