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The high-P T trigger provides valuable extension for the physics capabilities of HERA-B fixed target experiment. Trigger performs fast and effective selection of various B meson decay modes important for CP violation and B s mixing rate measurements. HERA-B high-P T trigger is built up of three layers of gas detectors placed inside the magnet area. Tests with full-scale detector modules have been done in real conditions. The installation of trigger components in the HERA-B detector is nearly completed.