Marxophone - Keyboard Instruments from 1900 - 1930

When researching the Japanese Taishogoto harp, I came across some very interesting instruments. Keyboard instruments that were developed between 1900 and 1930. I have built a small series of 5 of them. The Marxophone was made with the patent of Henry Charles Marx. Henry Charles Marx (1875-1947) was the American inventor of numerous musical instruments.