| http://www.w3.org/ns/prov#value | - Also, the plates 30 and 32 could include a substantially horizontal posterior intersomatic extension, located in the space S and between which a bias system, e.g. a spring or fluid damper, would be provided. [0050] For the cervical rachis, the plates 30 and 32 are concave to respect the natural cervical lordosis of the anterior wall of the cervical spine and to guide harmonious flexion-extension m
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