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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Siemens and Halske AG
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Siemens and Halske AG
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Application filed by Siemens and Halske AGfiledCriticalSiemens and Halske AG
Application grantedgrantedCritical
Publication of FR675839ApublicationCriticalpatent/FR675839A/fr
H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR675839D1928-09-111929-05-28Dispositif pour l'émission téléphonique de signaux acoustiques dans les voitures de transport en commun
ExpiredFR675839A
(fr)