GS0091: Software for testing and maintenance of electronic equipment for land, marine or fluvial vehicles, airplanes, spacecraft and missiles, automatic control machines in the nature of benches for testing electronic and avionic equipment
GS0421: Design and updating of software for testing and maintenance of electronic equipment for land, marine or fluvial vehicles, airplanes, spacecraft and missiles; design of software for automatic control apparatus and instruments in the nature of benches for use in testing electronic and avionic equipment