METAL NON-FITTED EXTENSIBLE COVERS FOR PROTECTING GUIDING RAILS OF METAL WORKING MACHINES; METAL NON-FITTED EXTENSIBLE STEEL COVERS IN TELESCOPIC, BELLOWS, APRON OR ROLL-AWAY FORM FOR PROTECTING GUIDING RAILS OF METAL WORKING MACHINES; METAL NON-FITTED EXTENSIBLE COVERS FOR PROTECTING GUIDING RAILS OF WOODWORKING MACHINES; NON-FITTED EXTENSIBLE STEEL COVERS IN TELESCOPIC, BELLOW, APRON OR ROLL-AWAY FORM FOR PROTECTING BUILDING RAILS OF WOODWORKING MACHINES; AND, METAL NON-FITTED CASINGS FOR L...