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| Number | Title | Issue Date |
| 4831508 | Power supply system having improved input power factor A circuit and method using a low frequency active switch for improving input power factor in power supplies utilizing a full wave rectifier and capacitor filter for supplying a filtered DC voltage from an AC power source. A switch control activates and de... | 05/16/1989 |
| 4567317 | EMI/RFI Protected enclosure An EMI/RFI shielded housing for an electrical apparatus comprises a case member and a complementary cover member, each comprising an end wall portion and a side wall portion together defining substantially continuous and unbroken peripheral surfaces. The ... | 01/28/1986 |
