A golf practicing device for use by a golfer by mounting it on his head when the golfer trains himself in hitting a golf ball with a golf club, which constantly permits accurate hitting of the ball and thus can serve for improvement of the golfer's golfing skill. The device comprises a body and a vision...http://www.google.es/patents/US4852882?utm_source=gb-gplus-sharePatente US4852882 - Device for golf practicing
