42 Design and development of engineering products, namely, electrical circuits and circuit boards, electronic circuit boards, integrated circuits, circuit boards provided with integrated circuits, printed circuit boards, electric relays, electric pulse-operated relays, electric time delay relays, electric multifunction relays, electric standard relays, electric stepper relays, electric micro relays, electric high-current relays, electric semiconductor relays, electric interval relays, electric flasher relays, electric glow time relays, electric motor polarity reversal relays, electric special relays, electric decoupling relays, electric bistable relays and electric relays adapted to various wiring and pin connection, pulse amplifiers, impulse splitters in the nature of signal splitters for electronic apparatus; development and design of aluminum castings; construction drafting, and engineering services in the field of electronics, software, casings and plug structures; development and design of electronic controllers for automotive and trailer related applications; development and programming of communications interfaces in connection with electronic controllers for automotive and trailer related applications; development and programming services for controller area network (CAN bus) systems; development and programming of controller area network (CAN bus) systems; engineering services in the field of automotive and trailer related applications, in particular development services relating to automotive special solutions in the nature of electronic interfaces for signal control and data communication, controller area network (CAN bus) interfaces, busways, CAN bus systems and electronic controllers equipped with the aforesaid interfaces and systems, operating elements in the nature of electronic interfaces for signal control and data communication, controller area network (CAN bus) interfaces, busways, CAN bus systems and electronic controllers equipped with the aforesaid interfaces and systems, complete kits for towing trailers, rain sensors for utility vehicles, voltage monitors; conducting technical performance tests and technical auditing in the field of automotive and trailer related applications; battery monitoring relating to technical matters, namely, monitoring of stationary batteries; engineering design, namely, custom design and development of prototypes, configuration of computer software being computer programming services, configuring computer hardware using software being computer programming services