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| Number | Title | Issue Date |
| 5357340 | Method for spectroscopy using two Fabry-Perot interference filters The invention relates to a process for Fabry-Perot spectroscopy using a spectrometer in the radiation path of which there is a radiation source, two successive Fabry-Perot interference filters through which the radiation passes, a blend of substances to b... | 10/18/1994 |
| 5138248 | Load independent current feeding circuit A circuit having a load connected to ground, a measuring resistor connected in series with the load; a current source feeding current into the load and the resistor, a different amplifier having one output connected to one end of the resistor and having i... | 08/11/1992 |