Adapter plugs; Banana plugs; Converters for electric plugs; Covers for the prongs of electric plugs; Dust proof plugs for earphone jacks; Electric outlet covers; Electric plugs; Electrical plug device enabling connection and disconnection of power and/or control cables; Electrical plugs and sockets; Plug adaptors; Plug gauges; Power adapters for use in vehicle lighter sockets; Pressure indicating plugs for valves; Round plug connectors; Safety contact plugs