The present invention is a trifunctional golfing cage having an elongated flat playing surface base with a tee off area at its front, a free standing frame, a first netting connected to the frame so as to enclose sides, back and top areas of the base, a second netting hanging down in front of the back...http://www.google.de/patents/US4538814?utm_source=gb-gplus-sharePatent US4538814 - Trifunctional golfing cage
