US PATENT SUBCLASS 181 / 138
Current as of: June, 1999
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(under the class definition) Subject matter wherein sound is transmitted by the vibrations of molecules set up by mechanical means in a wire, string or flexible member strung taut.
SEE OR SEARCH CLASS
379, Telephonic Communications, appropriate subclasses for transmission of sound by means of electrical devices.
381, Electrical Audio Signal Processing Systems and Devices, appropriate subclasses for one-way electrical transmission of audio signals.
446, Amusement Devices: Toys,
141+, for a toy telephone which is not capable for transmitting sound.