year is the sink of electrical matter for battery-operated machine
electric_drill is electrical_device. electrical_supply_company is supply_company. milking_machine is electrical_device. two_terminal_electrical_device is electrical_device. battery is electrical_device. electrical_outlet is socket. electric_motor is electrical_device. battery_powered_device is electrical_device. battery_recharger is electrical_device. electrical_terminal is electrical_device.