| http://www.w3.org/ns/prov#value | - A dental patient chair comprising a headrest, a backrest, a headrest carrier, first means for adjustably positioning the headrest carrier in said backrest, second means disposed in said headrest carrier for positioning the headrest relativeto said headrest carrier, said second means including a bracing member pivotably connected to the headrest on a first axis and a link extending at least the len
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