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| Number | Title | Issue Date |
| 7046814 | Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal The invention concerns an online low frequency amplifying interface operating in automatic cutting feed, particularly designed for multimedia computers. It concerns a impedance adapting device produced around an electronic tube. It can be arranged between a source t... | 05/16/2006 |
