An improved brush cutter having an upper feed control member with stop, forward, neutral, and reverse positions also has a lower feed stop member with selectable sensitivity. With the disclosure, in the case that the difference between the voltage of the battery and the supply voltage is small, by regulating the supply voltage and comparing the voltage difference across the overcurrent protector again, accurate detection of the state of the overcurrent protector for the battery as well as reduction of detecting costs is enabled. The spin torque oscillator is effectively separated into two regions by utilizing the step. The invention further relates to the discovery that G-CSF treatment of a patient who had suffered an acute stroke resulted in a significant improvement in neurological function, the patient having minimal observable disability seven years later. The validation hash is compared to a partial hash of the multiple partial image hashes to determine code integrity of the portion.