| http://www.w3.org/ns/prov#value | - With reference to FIGS. 2 and 3, a leaktight, thin wall housing 60 for the electrode plate stack (electrode plates and separators) is fabricated from two thin sheets 61 and 62 of a flexible polymeric material such as polyethylene, fluorinated ethylene propylene, polyethylene terephthalate, or other similar materials, or combinations thereof, which have a low oxygen and water vapor permeability cha
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