Կյուրեղ Դեմյան) (1772–1849) was an Austrian inventor of Armenian-Romanian origin, who made his living as an organ and piano maker with his two sons, Karl and Guido, in Vienna, Austria.

[1] Demian's accordion was described in the original German patent as follows: "Its appearance essentially consists of a little box with reeds 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.

At that time in Vienna, mouth harmonicas with Kanzellen (chambers) had already been available for many years, along with bigger instruments driven by hand bellows.

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.

16 g, MW], only if there are more chords will it become longer and some Loths heavier, so it is easy and comfortable to carry and should be a welcome invention for travelers, country and parties visiting individuals of both sexes, especially as it can be played without the help of anybody.