symmetry is the sink of electrical matter for battery-operated machine
microwave_tower is unnatural_thing. franking_machine is machine. milking_machine is electrical_device. two_terminal_electrical_device is electrical_device. sewing_machine_operator is sewer. ironing_board is mechanical_device. machine is apparatus. milking_machine is machine. vertebral_arch_joint_series is solid_object. milking_machine is mechanical_device.