U.S. federal trademark · Serial No. 85274803 · Reg. No. 39728948
Heat recovery systems for the improvement of industrial plants and for the efficiency of fossil fired power plants, namely, heat exchangers not being parts of machines and component parts thereof, namely, electric space air heaters, low pressure air preheaters, flue gas cooling apparatus, steam air preheaters, plate air preheaters, waste heat boilers
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