| http://www.w3.org/ns/prov#value | - A device for cooling at high temperature, high pressure vessel according to claim 10 or 11, including a ring mounted at a lower end face of said high pressure vessel and having formed therein an cooling medium tank which has a cooling medium inlet passage and a cooling medium outlet passage, wherein a lower end of said cooling medium jacket is fitted in said ring, and said cooling medium jacket ha
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