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| Number | Title | Issue Date |
| 4634811 | Call screening system A call screening system to be added onto and used with a PBX or Centrex telephone system having an attendant answering console. The call screening system enables incoming calls for various telephone extensions to be directed to another telephone extension... | 01/06/1987 |
| 4629831 | Series connected interceptor The series connected interceptor is a control system for assisting in providing improved service operations for a PBX system. This control system is connected in series in a DID trunk between a TELCO central office and a PBX. By the nature of where it is ... | 12/16/1986 |
