(under the class definition) Subject matter forming an instrument used to convey sounds to the ear of a user.
(1) Note. If the instrument is particularly adapted for use on or in a living body, classification is in Class 128, Surgery, but if the instrument can be used generally (e.g., to detect leaks or the internal sounds of machinery) classification is here.
SEE OR SEARCH CLASS
181, Acoustics,
131, for mechanical stethoscopes.
600, Surgery,
528, for specific structure, adapted to be placed on or in a living body, for detecting sounds emanating from the heart.
