The anti-rotation device (200, 200') comprises an inner anti-rotation part (10) for preventing the rotating of the pivot head (101), an outer anti-rotation part (20, 20') for preventing the rotating of the inner anti-rotation part (10), and a fixer (30) for fixing the inner anti-rotation part (10) to the outer anti-rotation part (20, 20').
Entre I' homme- chien et le serpent a deux tetespatents-wipo patents-wipo