72421174
Apr 12, 1972
Jan 16, 1973
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
Natural Agricultural Products