Founded in 1946, Louisville Ladder Inc is one of the largest manufacturers of ladders in North America. The companys headquarters is located in Louisville, KY and it has a network of warehouses in various cities throughout the United States and Canada. Since its beginning Louisville Ladder has been an industry leader in product innovation. First aluminum step and extension ladder. Revolutionary aluminum step and extension ladder construction, with steps using a channel that had the steps riveted directly to the rail flange; and with extensions using a patented rung-to-rail connection. Knocked-down steel rolling warehouse ladder. First line of fiberglass ladders, including an extension ladder using the patented rung-to-rail connection with aluminum washers on both sides of the rail. - First structural foam-molded stepladder top. - First powder-coat paint on the steel product line. - Patented steel rolling tower that could be set up by one person. - Patented Quicklatch on rung locks. - The only fiberglass mobile work platform. - Full Metal Boot wrap-around shoe assembly for stepladders. - Rhino 375 Series, the first ladder with a 375-pound weight capacity. PROTOP is a Multifunctional top designed to increase the productivity of the worker that earns a living using a fiberglass extension ladders. PRO TOP is a non-conductive work tray, molded copolymer with practical and convenient holes and slots for tools.