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| US4315206 | 24 Sep 1979 | 9 Feb 1982 | Nippon Telegraph and Telephone Public Corporation
Oki Electric Industry Co., Ltd.
Nippon Electric Co., Ltd.
Fujitsu Ltd.
Hitachi, Ltd. | Current supply circuit for telephone exchange |
| US4355240 | 22 Jun 1981 | 19 Oct 1982 | Bell Telephone Laboratories, Incorporated | Auxiliary backup regulator control for paralleled converter circuits controlled by a master regulator |
| US5179493 | 20 Jul 1990 | 12 Jan 1993 | Kabushiki Kaisha Toshiba | Multiple power supply system |
