symmetry is the sink of electrical matter for battery-operated machine
vertebral_arch_joint_series is solid_object. microwave_tower is unnatural_thing. milking_machine is mechanical_device. milking_machine is machine. milking_machine is not electrical_device. ironing_board is mechanical_device. machine is apparatus. milking_machine is electrical_device. microwave_tower is not unnatural_thing. sewing_machine_operator is sewer.