Patent 9959849 was granted and assigned to Yamaha (yacht) on May, 2018 by the United States Patent and Trademark Office.
A drum, including: a shell; at least one head; and a vibration damping portion including at least one of (a) an outer-surface facing surface which is disposed in substantially parallel with and is closely opposed to an outer surface of an outer peripheral portion of the at least one head without contacting the outer surface and (b) an inner-surface facing surface which is disposed in substantially parallel with and is closely opposed to an inner surface of the outer peripheral portion of the at least one head without contacting the inner surface.