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A 5.4 m-long 239-pole undulator comprising three rigid and precise standardized-unit undulators was completed and installed in the Tristan main ring, which was operated as a light source at a beam energy from 8 to 10 GeV. This undulator was successfully tested, characterized and used as a brilliant hard X-ray source for several synchrotron radiation experiments during the last 3.5 months of 1995.