A garment comprising different portions having different performance characteristics. A jacket can be affixed around the liquid delivery pipe so as to allow the liquid delivery pipe to be removed from the nose member subsequent to the installation in the earth. A plurality of solid-state switches control three phases of the motor in response to the three duty cycle values, respectively. Any user can calculate other user’s public key based on other user’s identity and the published public key calculating base. An etchant for thinning the gate electrode may be introduced through an opening in an insulating film on the substrate.