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| Number | Title | Issue Date |
| 4924497 | Pay station telephone interface circuits An interface (10) is disclosed for coupling a conventional pay station telephone (12) to a telephone switching system (16). The interface (10) provides supervision signal detection functions normally provided by a switching system, and thus can be connect... | 05/08/1990 |
| 4916733 | Pay station telephone call answer supervision apparatus An interface (10) is disclosed for coupling a conventional pay station telephone (12) to a telephone switching system (16). The interface (10) provides supervision signal detection functions normally provided by a switching system, and thus can be connect... | 04/10/1990 |
