Cyrill Demian (1772–1849) of Armenian origin, made his living as an organ and piano maker, with his two sons Karl and Guido, in Mariahilfer Straße No. 43 in Vienna, Austria. On May 6, 1829, Cyrill and his two sons presented a new instrument to the authorities for patent - the accordion. The patent was officially granted on May 23, 1829.
(Translated Summary of Original Old-German Manuscript)
Its appearance essentially consists of a little box with feathers of metal plates and bellows fixed to it, in such a way that it can easily be carried, and therefore traveling visitors to the country will appreciate the instrument.
It is possible to perform marches, arias, melodies, even by an amateur of music with little practice, and to play the loveliest and most pleasant chords of 3, 4, 5 etc. voices after instruction.
The advent of the accordion is the subject of debate among researchers. Many credit Christian Friedrich Ludwig Buschmann, as the inventor of the accordion, while others give the distinction to Cyrill Demian an Armenian from the Romanian city of Gherla (ancient Armenopolis) living in Vienna, who patented his Accordion in 1829, thus coining the name. A modification of the Handäoline, Demian’s invention comprised a small manual bellows and five keys, although, as Demian noted in a description of the instrument, extra keys could be incorporated into the design. Numerous variations of the device soon followed.
(Translated Summary of Original Old-German Manuscript)
1st - In a box 7 to 9 inches long, 3½ inches wide and 2 inches high, feathers of metal plates are fixed, which were known for more than 200 years as Regale, Zungen, Schnarrwerk, in organs.
2nd - With bellows fixed to the above box and its 5 claves fixed below, even an amateur of music can play the loveliest and most moving chords of 3, 4 and 5 voices with very little practice.
3rd - Each claves or key of this instrument allows two different chords to be heard, as many keys are fixed to it, double as many chords can be heard, pulling the bellows a key gives one chord, while pushing the bellows gives the same key a second chord.
4th - As this instrument can be made with 4, 5 and 6 or even more claves, with chords arranged in alphabetical order, many well known arias, melodies and marches, etc. may be performed similar to the harmony of 3, 4 and 5 voices, with satisfaction of all anticipations of delicacy and vastly amazing comfort in increasing and decreasing sound volume.