摘要 |
<p>Track means 10 are located parallel to the stacks 5; a frame 20 runs along the tracks 10; the frame 20 is moved mechanically by appropriate means along the tracks 10; the frame 20 carries a column 30, to which a horizontal arm 40, which is moveable in order to rotate around a vertical axis, is fixed; the free end of the arm 40 carries appropriate object pick-up means 50.</p> |