Class 37

Maintenance and cleaning of {indicate specific objects, e.g., HVAC systems, machinery, water pipelines, etc.} 037-3049

{指明具体物体，例如暖通空调系统、机械、供水管道等}的维护和清洁

Chinese {指明具体物体，例如暖通空调系统、机械、供水管道等}的维护和清洁

English Maintenance and cleaning of {indicate specific objects, e.g., HVAC systems, machinery, water pipelines, etc.}

Spanish Mantenimiento y limpieza de {indique objetos específicos, por ejemplo, sistemas de climatización, maquinaria, tuberías de agua, etc.}