U.S. federal trademark · Serial No. 85172557 · Reg. No. 4137615
a mechanical oscilloscope exhibited in science museums or classrooms to help the viewer understand relationship between sound and wave forms which visually displays a vibrating musical string as a sinusoidal wave and does not use optics or electricity
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.