U.S. federal trademark · Serial No. 71588615 · Reg. No. 0568712
MAINTENANCE TANKS IN THE FORM OF RELATIVELY DEEP PANS FULLY OPEN AT THE TOP AND PROVIDING A LIQUID HOLDING CHAMBER WITHIN WHICH VISCOUS UNIT TYPE FILTERS ARE CLEANED BY WASHING WITH HOT WATER OR STEAM AND THEN RECHARGED WITH A COATING OF A DUST CATCHING LIQUID BY IMMERSION THEREIN
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