42 development and design services for others of printed circuit boards and electronic components for use with printed circuit boards, namely, capacitors, resistors, inductors, coils, diodes, transistors, integrated circuits, chip carriers, connectors, sockets, switches, crystals, relays, jumpers, thermistors, optoelectronics, modules, dual in line packages consisting of capacitors, resistors, diodes and transistors, and card-on-board assemblies