Heimann Joseph Michael dating history

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Heimann (Hayyim) Michael (April 12, 1792 – June 10, 1846) was a Hebrew bibliographer born at Hamburg. He showed great acuteness of mind in early childhood, had a phenomenal memory, and was an indefatigable student. He studied Talmudics and received private instruction in all the branches of a regular school education. He was a born bibliophile, and began to collect valuable works when still a boy of twelve. With his progress in Hebrew literature his love for books increased also, the result of which was his magnificent library of 862 manuscripts and 5,471 printed works, covering all branches of Hebrew literature. There were few books in his collection which he had not read, and he undertook the preparation of a full catalog of it. As far as he accomplished this task, it was the foundation of the Ozerot Hayyim, Katalog der Michael'schen Bibliothek, Hamburg, 1848.