OBLACK, MARK J.,BAGLEY, JUSTIN A.,KENT, JOSEPH W.,BURGER, KYLE D.
申请号：
CA2935376
公开号：
CA2935376C
申请日:
2009.12.22
申请国别(地区):
CA
年份:
2020
代理人:
摘要：
A ball includes a body having an outer surface. A chamber is disposed within the body and has a concave curvature in at least two orthogonal directions. An aperture defines a fluid connection between the chamber and the outer surface of the ball. Air flow across the aperture produces a whistling sound.
