In 1990, the new head office building, known as the "Super Tower", was completed in Shiba, Tokyo. Additionally, joint-venture agreements were established to manufacture and market digital electronic switching systems and LSIs in China. In 1993 NEC's asynchronous transfer mode (ATM) switching system, the NEAX61 (Nippon Electronic Automatic Exchange) ATM Service Node, went into service in the United States. NEC Europe, Ltd. was established as a holding company for European operations the same year. The NEC C&C Research Laboratories, NEC Europe, Ltd. were opened in Germany in 1994. NEC (China) Co, Ltd. was established as a holding company for Chinese operations in 1996. In 1997 NEC developed 4Gbit DRAM, and their semiconductor group was honored with one of the first Japan Quality Awards. In 1998, NEC opened the world's most advanced semiconductor R&D facility.