Fleit, Jacobson, Cohn & Price
Signal processors for digital telephone exchanges
 A digital telephone exchange including a first and second processor in which the second processor contains algorithms selectable by the first processor for operation of functions within the exchange, and in which subscribers' apparatus is connectable to both processors via bus structures and in which signals are passed along the bus structures between connected subscribers under the command of both processors. 
Plessey Overseas Limited
H
H04Q
inventional
Stuart J. William G.
Mason Harris