The Magnus Harmonica Corporation (originally the International Plastic Harmonica Corporation) was founded in 1944 in New Jersey by Danish immigrant Finn Magnus (1905–1976).
[1] First supplying American troops in World War II, and later marketed to children and other beginners, the company's harmonicas (as well as its accordions, bagpipes, and mechanical reed organs) used a then-unique molded-plastic reed comb.
The styrene-based plastic construction resulted in lower cost, greater durability, and a distinct sound compared to other free reed aerophones with metal reeds.
[2][3][4][5][6] In 1958, Magnus joined with television salesman Eugene Tracey, and their company went on to sell millions of inexpensive electric chord organs and song books[7][8] until the late 1970s under the name Magnus Organ Corporation.
[9] At its peak, Magnus employed over 1,800 workers in Linden, New Jersey, including a "mother's shift" during school hours and a "work release" program for non-violent inmates of the nearby Rahway State Prison.