U.S. federal trademark · Serial No. 71545475 · Reg. No. 0533305
SURGICAL DRAINAGE PUMPS EACH HAVING A WORKING CHAMBER LINED WITH AN ELECTRICAL RESISTANCE FILAMENT ALTERNATELY ENERGIZED AND DE-ENERGIZED TO EFFECT EXPANSION AND CONTRACTION OF THE GAS THEREIN AND VALVED TO PROVIDE AN UNIDIRECTIONAL FLOW OF THE GAS THERETHROUGH
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