A power tool of the type comprises a housing, a rotation motor, an output shaft carrying and rotating a working implement, and a grease lubricated angle drive coupling the output shaft to the motor, wherein the angle drive includes a gear chamber containing lubricating grease, a pinion connected to the motor, and a bevel gear secured to the output shaft. A plurality of processing CPUs execute the transaction according to an instruction from the transaction inputoutput CPU. Each of the plurality of agents has means for communicating with one another, and means for generating a network management information response to a network management information request, which has been issued by a network information manager, after each agent has processed the network management information request in distributed fashion.