9 Computer Software and manuals sold as a unit therewith for inventory control of components of firing circuits for detonating explosives, namely, detonators, connectors, fuses, electronic blasting machines and associated programming equipment; computer software and manuals sold as a unit therewith for designing the interconnection, placement and size of a plurality of explosive charges in such firing circuits in order to enhance the efficiency of the explosive in blasting, quarrying and mining operations; electrical connectors used for electrically and mechanically interconnecting detonators, fuses and electronic blasting machines into firing circuits for detonating explosives; electronic testing equipment for testing integrity of firing circuits; programming equipment, namely, computer hardware used to program electronically controlled components of firing circuits