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Patent for Sale:Private Listing: Number 3773
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Class 181: Acoustics
Devices and corresponding methods for mechanically transmitting, for amplifying and for ascertaining the direction of sound and for mechanically muffling or filtering sound, and not elsewhere provided for.Subclass 200: Machine type enclosure
Subclass 202: Electical type devices (e.g., transformers, motors, etc.)
Subclass 204: Internal-combustion engine
Subclass 208: Damping of flexural structure