U.S. federal trademark · Serial No. 72421174 · Reg. No. 0950773
SELF-CLEANING AIR FILTERS EMPLOYING AN OIL BATH AS A CLEANING MEDIUM FOR FILTERING AIR IN CONJUNCTION WITH INDUSTRIAL AND DOMESTIC AIR CONDITIONING SYSTEMS, AND EXCEPTING AIR FILTERS USED IN CONJUNCTION WITH THE INDUCTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE OR AS A PART OR REPLACEMENT PART THEREOF; AND FILTER CELLS THEREFOR
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