1. APPARATUS FOR CUTTING A BODY OF EXPANDED CELLULAR RESINOUS MATERIAL COMPRISING, IN COMBINATION, MEANS FOR ADVANCING THE CELLULAR BODY STEADILY ALONG A GENERALLY FIXED PATH, STATIONARY SUPPORTING MEANS IN SPACED RELATION TO THE PATH OF MOVEMENT OF SAID BODY, A FIRST PAIR OF BLADE SUPPORT MEMBERS EACH ADAPTED TO SECURE A PLURALITY OF BLADES AND INCLUDING AXIAL MEMBERS PIVOTALLY MOUNTING SAID BLADE SUPPORT MEMBERS ON THE STATIONARY SUPPORTING MEANS AT OPPOSING SIDES OF SAID PATH OF MOVEMENT, A SECOND PAIR OF BLADE SUPPORT MEMBERS EACH ADAPTED TO SECURE A PLURALITY OF BLADES AND INCLUDING AXIAL MEMBERS PIVOTALLY MOUNTING SAID SECOND PAIR OF BLADE SUPPORT MEMBERS ON THE STATIONARY SUPPORTING MEANS AT THE SAME OPPOSING SIDES OF THE PATH OF MOVEMENT AS SAID FIRST PAIR OF BLADE SUPPORT MEMBERS AND IN SPACED RELATION THERETO, A PLURALITY OF THIN SPACED BLADES IN THE PATH OF SAID CELLULAR BODY, MEANS PIVOTALLY SECURING SAID BLADES ALTERNATELY ON THE FIRST AND SECOND PAIRS OF BLADE SUPPORT MEMBERS, AND MEANS FOR SIMULTANEOUSLY RECIPROCATING SAID PAIRS OF BLADE SUPPORT MEMBERS IN OPPOSING SHORT STROKE MOVEMENT TO CUT A PLURALITY OF SLABS FROM THE CELLULAR BODY AS THE BODY MOVES INTO SAID BLADES.