Martin Marietta Corp’s Information Systems & Technologies unit in Frazer, Pennsylvania is joining forces with Bell Atlantic Corp network integration unit to provide systems and network integration services. Going after large companies in finance, banking, pharmaceuticals and health care, the Martin Marietta unit will offer large-scale systems design and network integration, including imp lementation, testing and mainten ance while the Bell Atlantic arm will contribute consulting, design, installation and support of local and wide area networks to the team.