AC generators; AC variable frequency drives that are used to control small and medium-sized motors in applications such as manufacturing processes, HVAC and pumps; Aerating pumps for aquaria; Alternators; Aquarium pumps; Axial flow pumps; Bilge pumps; Biodiesel-generation machines, namely, mixing equipment, pumps and heaters; Centrifugal pumps; Circulating pumps; Counter-current swimming machines for use in swimming pools to enable swimming in place against an adjustable counter-current, feat...