| http://www.w3.org/ns/prov#value | - The device according to claim 1, further comprising a height adjustment mechanism for adjusting the height of said rear cradle, the mechanism including a screw rotatably disposed in said rear support and a thumbwheel fixedly attached to the inner support element of said rear support and rotatably disposed about said screw, said rear cradle being disposed on said screw, the height being adjusted by
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