기계 또는 기관의 냉각일반; 내연기관의 냉각(차량용 추진장치의 냉각기, 배치에 관한 것 b60k 11/00; 열전달, 열교환 혹은 열저장 물질 c09k 5/00; 열교환 일반, 라디에이터 f28) cooling of machines or engines in general; cooling of internal-combustion engines (arrangements in connection with cooling of propulsion units in vehicles b60k11/00; heat-transfer, heat-exchange or heat-storage materials c09k5/00; heat-exchange in general, radiators f28) 