A process for forming the facial isomer of an aluminum trisquinoline complex comprises heating the solid aluminum trisquinoline complex material at a temperature at least 50\xb0 C. According to the apparatus of the present invention, a comb-like capacitor element member having a plurality of rectangular metal foil pieces bonded can be produced efficiently, by bonding the elongated tape-like metal foil without damaging it. The encrypted-hashed PIN always remains in an encrypted form while in the hands of the third party processor.