Product research; design and testing of new products for others; technical consultation and assistance related to the design of aircraft and aircraft parts; custom design of aircraft; technical consultation related to aerospace engineering; technical consultation and assistance related to the certification, operation, overhaul or modification of aircraft and aircraft parts, namely, design of aircrafts and aircraft parts for others; technical services, namely, technology consultation in the field of aerospace; inspection of aircraft and aircraft parts; consulting services in the field of communications, namely, consulting in the field of telecommunications technology