35 Operation of a business for others, involved in the fields of design, manufacture, distribution, sales, and installation of retaining wall blocks and retaining wall systems; wholesale distributorships, wholesale services by direct solicitation by sales agents, wholesale store services; sale and retail distributorships, retail supply outlets, and retail outlets featuring retaining walls, modular units for retaining walls, precast concrete retaining wall systems, building materials, namely, pre-cast concrete wall forms, concrete blocks, concrete construction blocks, concrete retaining walls, cable clips of metal, cable thimbles of metal, metal cable wire, metal casting forms for concrete, pilings of metal and metal hooks for concrete blocks, footings and fascia boards