| http://www.w3.org/ns/prov#value | - In a fourth aspect, the invention is a system for holding a package which comprises a platen having a first and second lateral half; a package disposed on the platen; and a means for clamping the package to the platen, the means comprising a curved clamp disposed on the first lateral half of the platen, the first clamp moveable through a horizontal axis of rotation and operable to grasp the packag
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