| http://www.w3.org/ns/prov#value | - Further as the drying agent referred to in the present invention, there are suitable salts capable of forming hydrates, namely, salts which absorb water as the crystalline water, in particular, phosphates such as sodium dihydrogenphosphate, sodium monohydrogenphosphate, sodium phosphate, lithium phosphate and sodium pyrophosphate, etc., particularly anhydrides thereof are most suited for the prese
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