| http://www.w3.org/ns/prov#value | - A nonvolatile read only memory according to claim 4, wherein said constant potential circuit comprises:a fourth MOS transistor of an enhancement type which receives at one end the power source voltage; a fifth MOS transistor of a depletion type which is connected at one end to the other end of said fourth MOS transistor and at the gate and other end to a reference potential; a sixth MOS transistor
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