thumb|1956 Soviet stamp presenting Kryakutnoy as a real person Kryakutnoy () or Furtzel () was a fictional early 18th-century Russian inventor, who allegedly invented the hot air balloon fifty years before the Montgolfier brothers.
thumb|1956 Soviet stamp presenting Kryakutnoy as a real person Kryakutnoy () or Furtzel () was a fictional early 18th-century Russian inventor, who allegedly invented the hot air balloon fifty years before the Montgolfier brothers.
In 1820s or 1830s a collector and well-known forger Aleksandr Ivanovich Sulakadzev claimed to have discovered a following fragment in a chronicle attributed to a Ryazan police officer:
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).