| 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 front cradle, the mechanism including a screw rotatably disposed in said front support and a thumbwheel fixedly attached to the inner support element of said front support and rotatably disposed about said screw, said front cradle being disposed on said screw, the height being adjuste
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