42 [Consultation in the field of oil and gas refineries; exploration of crude oil;] design of process equipment for others, said equipment for use in the refining, chemical, food processing, paper, textiles and energy industries; [architectural design of natural gas treating facilities; development and design of liquid-liquid extraction equipment for others; design of partial discharge monitoring equipment, for others, for large electric motors and generators;] industrial process diagnostics testing, namely, distillation column scanning, tracing, infrared, radiography, magnetic particle, ultrasonic and liquid penetrant testing, for the processing, electrical and manufacturing industries; engineering and design services in the field of mass transfer plants and equipment; consulting, engineering and design services for others in the field of crossflow membrane filtration processes and filtration systems for the industrial, food, water, chemical, environmental protection, and biotechnology industries[; and engineering and design services for others in the field of heat transfer equipment]