Dynaphone
Dynaphone monophonic *electrophonic instr. of the electronic type, invented by René Bertrand in 1938 (37). Buchner, Alexandr. Mechanical Musical Instruments. London, n.d.
Dynaphone monophonic *electrophonic instr. of the electronic type, invented by René Bertrand in 1938 (37). Buchner, Alexandr. Mechanical Musical Instruments. London, n.d.