April 22, 1892: Nikolay Borisovich Obukhov is born in Olshanka, Kursk Province, Russian Empire, the son of Boris Trofimovich Obukhov, a nobleman, and Yekaterina Alyeksandrovna Obukhov.
July 15, 1915: According to Nikolay Borisovich Obukhov (23), this is the day he invents his new method of notation which eliminates accidentals.
June 3, 1926: Preface au Livre de Vie for two pianos, four soloists, and orchestra by Nicolas Obouhow (34) is performed for the first time, in Paris, the composer at one keyboard. It is the first part of his massive Le Livre de Vie, a work of about 2,000 pages.
May 15, 1934: Nicolas Obouhow (42) gives the first demonstration of his Croix Sonore, an electronic instrument shaped like a cross, in Paris. It has properties similar to the Theremin and Ondes Martenot.