After the door has been separated from the doorway , the door is translated by means of a suitable rack integral with the door, engaged by a gear wheel which is driven through suitable gears by another rack which in {HEAD ~ turn} is driven by a rod of {TAIL ~ a fluid actuated cylinder}  
After the door has been separated from the doorway , the door is translated by means of a suitable rack integral with the door , engaged by a gear wheel which is driven through suitable gears by another rack which in { HEAD ~ turn } is driven by a rod of { TAIL ~ a fluid actuated cylinder }
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