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Hero (or Heron) of Alexandria was a 1st-century mathematician and engineer, famous for inventing the steam engine precursor known as the aeolipile.
Hermann Schöne (1870–1941) was a German classical philologist who specialized in ancient technical and medical texts.
original: "Lipsiae"
B. G. Teubner was a major German publishing house renowned for its definitive editions of ancient Greek and Latin literature.
Likely the initials of a previous owner or a specific library classification.