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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbHfiledCriticalLicentia Patent Verwaltungs GmbH
Application grantedgrantedCritical
Publication of FR888179ApublicationCriticalpatent/FR888179A/fr
H04M9/00—Arrangements for interconnection not involving centralised switching
H04M9/001—Two-way communication systems between a limited number of parties
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR888179D1938-12-301942-10-05Installation de haut-parleur à changement de sens de conversation pour la transmission d'ordres ou avis
ExpiredFR888179A
(fr)