Antonelli, Terry, Stout & Kraus, LLP
Hierarchical network management system
 A hierarchical communication network management system is structured by a plurality of agents and sub-managers connected to lower communication networks and an integration manager connected to a higher communication network. Each of the sub-managers functions as an agent to the integration manager and functions as a manager to each agent, so that it becomes possible to employ a Simple Network Management Protocol (SNMP) between each agent and its sub-manager and between a sub-manager and the integration manager. 
Hitachi, Ltd.
H H Y H
H04L H04L Y10S H04L
inventional inventional additional inventional
Shinichi Yoshinori Masato Yasuhiro Shuji Takashi
Nakazaki Ooba Saito Tanaka Fujino Kagei