Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Schlumberger Instruments et Systemes SA
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Schlumberger Instruments et Systemes SA
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Application filed by Schlumberger Instruments et Systemes SAfiledCriticalSchlumberger Instruments et Systemes SA
Publication of DE2224250A1publicationCriticalpatent/DE2224250A1/de
Elektrische Weiche mit konstantem Eingangswiderstand, die als eine Reihen- bzw. Parallelschaltung von Teilfiltern mit einer negativen Reaktanz aufgefasst werden kann
Schaltungsanordnung fur eine sprachgeschutzte empfangseinrichtung fur mehrfrequenz-codewahl bei fernmeldevermittlungseinrichtungen, insbesondere fernsprechvermittlungsanlagen