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A fuel cell system that extracts water from the effluent of a fuel cell for supply to other components of the fuel cell system that require water. A preferred embodiment is a fuel cell system, for the production of electricity from hydrogen gas and an oxidant, comprising: (a) a fuel cell comprisi

A fuel cell system that extracts water from the effluent of a fuel cell for supply to other components of the fuel cell system that require water. A preferred embodiment is a fuel cell system, for the production of electricity from hydrogen gas and an oxidant, comprising: (a) a fuel cell comprising an anode input for a hydrogen-containing anode supply stream, a cathode input for an oxidant-containing cathode supply stream, and a cathode output for cathode effluent comprising water produced by said fuel cell; and (b) a water transfer device, connected to said fuel cell, that transfers water from said cathode effluent to said anode supply stream.

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A fuel cell system that extracts water from the effluent of a fuel cell for supply to other components of the fuel cell system that require water. A preferred embodiment is a fuel cell system, for the production of electricity from hydrogen gas and an oxidant, comprising: (a) a fuel cell comprisi

A fuel cell system that extracts water from the effluent of a fuel cell for supply to other components of the fuel cell system that require water. A preferred embodiment is a fuel cell system, for the production of electricity from hydrogen gas and an oxidant, comprising: (a) a fuel cell comprising an anode input for a hydrogen-containing anode supply stream, a cathode input for an oxidant-containing cathode supply stream, and a cathode output for cathode effluent comprising water produced by said fuel cell; and (b) a water transfer device, connected to said fuel cell, that transfers water from said cathode effluent to said anode supply stream. , Ahmed et al.; US-6221448, 20010400, Baetzold et al. (b) has a flexural modulus in elasticity of 0.5 to 0.9 GPa. 33. The polyester film of claim 18, wherein the polyester film has a thickness of 3 to 500 μm. 34. The polyester film of claim 33, wherein the polyester film has a thickness of 20 to 100 μm. 35. A polyester film which is composed of a blended resin consisting of (a) an amorphous polyethylene terephthalate resin, (b) a polyester ether resin in admixture at a weight ratio of 97/3 to 50/50, wherein the polyester ether resin (b) is prepared by copolycondensation of dicarboxylic acid and/or ester derivative thereof consisting mainly of terephthalic acid and/or ester deriv