| 摘要 |
Hydraulic pillow comprised of an upper water-filled cavity divided into various compartments, preferably four compartments which communicate between each other by means of a channel, the first compartment being slightly larger having a concave recess, the pillow having also a lower cavity similar to the former cavity but filled with air and providing for the regulation, by means of a valve, of the height and firmness of the pillow. <IMAGE> |
