31 WATER CHILLER AND TREATMENT APPARATUS-NAMELY, HEAT PUMP CHILLERS, PORTABLE WATER CHILLERS, WATER COOLED CHILLERS, CENTRAL SYSTEM WATER CHILLERS, SAND AND GRAVEL FILTERS, COOLING TOWERS, AND PARTS THEREOF
APRIL 1960 AS TO THE MARK "AEC" IN A DIFFERENT FORM. APRIL 1960 AS TO THE MARK "AEC" IN A DIFFERENT FORM. THE DRAWING IS LINED FOR THE COLOR GREEN BUT NO CLAIM IS MADE TO COLOR.