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Claim 1

IN DEVICE OF THE CLASS DESCRIBED HAVING A PLURALITY OF FILTER PLATES ARRANGED IN A HORIZONTAL ROW AND ADAPTED TO BE MOVED ON A HORIZONTAL TRACK ONE AGAINST ANOTHER, ELECTROMECHANICAL MEANS ADAPTED TO MOVE AND SEPARATE ADJACENT FILTER PLATES CONSECUTIVELY ALONG SAID HORIZONTAL TRACK INCLUDING A PLURALITY OF DRIVERS ACTUATED BY ELECTRICAL MEANS OPERATING IN PREARRANGED TIMED SEQUENCE AND ADAPTED TO ENGAGE FILTER PLATES AND MOVE THE SAME FROM ONE POSITION IN CONTACT WITH EACH OTHER TO ANOTHER POSITION IN CONTACT WITH EACH OTHERALONG SAID HORIZONTAL TRACK, EACH OF SAID DRIVERS COMPRISING A HOUSING, A DOG MOUNTED VERTICALLY IN SAID HOUSING AND RIDING ON A COMPRESSION SPRING, A CONTACT PLATE AFFIXED TO THE OUTSIDE OF THE DOG, A LIMIT SWITCH HAVING AN OPERATING LEVER MOUNTED ON SAID HOUSING IN PROXIMITY TO SAID CONTACT PLATE IN SUCH A MANNER AS TO PROVIDE CONTACT BETWEEN SAID CONTACT PLATE AND SAID OPERATING LEVER WHEN THE DOG IS IN AN INTERMEDIATE DEPRESSED CONDITION, A PIN AFFIXED TO THE DOG ON THE LOWER PORTION THEREOF AND EXTENDING OUTWARDLY THEREFROM, A LATCH AFFIXED TO THE HOUSING IN PROXIMITY OF THE DOG SO AS TO ENGAGE AND LATCH ABOUT SAID PIN WHEN THE DOG IS IN A TOTALLY DEPRESSED POSITION, AND MEANS POSITIONED ABOVE SAID DRIVER IN SPACED RELATION THERETO SO AS TO ENGAGE AND DEPRESS THE DOG WHEN THE DRIVER IS MOVED UNDER SAID MEANS; AND ELECTRICAL CONTROL MEANS TO DISENGAGE SAID DRIVERS FROM SAID FILTER PLATES AT THE CONCLUSION OF EACH MOVEMENT AND TO DISCONTINUE THE MOVEMENT OF SAID DRIVERS UPON THE CONCLUSION OF THE SEPARATING OPERATION.