Along with many, including Maurice Martenot, Obhukov was present at a demonstration of the thereminvox by its inventor Lev Termen (Leon Theremin) in 1924.
These projects included the development of an electronic instrument, the croix sonore, a device similar to the theremin but built in the shape of a cross, with the electronics hidden inside a brass orb to which the cross was affixed.
Croix de Guerre | Croix de guerre | St. Croix River (Wisconsin-Minnesota) | St. Croix River | Saint Croix, U.S. Virgin Islands | Sainte-Croix | La Croix-Rousse | La Croix | Saint Croix | Sainte-Croix, Switzerland | Steven St. Croix | St. Croix Falls, Wisconsin | Lus-la-Croix-Haute | La Croix-Valmer | croix de guerre | Croix | William de St Croix | Voyage au pays sonore ou l'Art de la question | St. Croix River (Wisconsin–Minnesota) | Saint Croix, New Brunswick | Rose-Croix | René de La Croix de Castries | G. E. M. de Ste. Croix | Frederick de St Croix Brecken | François Pétis de la Croix | Evelyn St. Croix Fleming | Croix Sonore | croix sonore | Croix-Rouge | Croix-en-Ternois |