#3529-3531 Hungary - Hungarian Developers of Technology (MNH)
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1996 Hungarian Developers of Technology, Set of 3. Designs: Inventor, invention: 24fo, Dénes Mihály (1894-1953), Telehor. 50fo, László József Bíró (1899-1985), mass-produced ball-point pen. 75fo, Zoltán Bay (1900-1992), lunar radar set.