7 MACHINES FOR FEEDING, LOADING AND FILLING INTERCONNECTED PLASTIC BAGS; MACHINE FOR SEALING SUCH BAGS AFTER THEY ARE FILLED AND/OR SEPARATING THEM FROM SUCH STRIPS, SUCH MACHINES FOR SEALING AND/OR SEPARATING BEING BOTH PART OR SEPARATE FROM SUCH MACHINES FOR FEEDING; CONVEYORS, AND STRUCTURAL AND REPLACEMENT PARTS FOR SUCH MACHINES AND CONVEYORS