HEAVY-DUTY INDUSTRIAL AND COMMERCIAL LADDER SYSTEMS AND LADDERS MADE FROM STEEL, STAINLESS STEEL OR ALUMINUM, NAMELY, ROLLING LADDERS, ROLLING PLATFORMS, WORK PLATFORMS, STOCK PICKING LADDER WITH SHELVES, TILT AND ROLL LADDERS, FOLDABLE SAFETY LADDERS, DUAL ENTRY WORK PLATFORMS, NON-FOLDING ROLLING STEP LADDERS, AERIAL PLATFORMS, MANUAL WINCH PLATFORMS, TRACK LADDER SYSTEMS AND LADDERS SUPPORTED BY OVERHEAD CARRIAGES OR FIXTURES MOUNTED ON TRACKS FOR SIDE TO SIDE, LENGTH AND/OR FOR SWINGING M...