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.)
Western Electric Co Ltd Canada
Siemens Brothers and Co Ltd
Western Electric Co Ltd Great Britain
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Western Electric Co Ltd Canada
Siemens Brothers and Co Ltd
Western Electric Co Ltd Great Britain
Automatic Telephone Manufacturing Co Ltd
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 Western Electric Co Ltd Canada, Siemens Brothers and Co Ltd, Western Electric Co Ltd Great Britain, Automatic Telephone Manufacturing Co LtdfiledCriticalWestern Electric Co Ltd Canada
Application grantedgrantedCritical
Publication of FR498829ApublicationCriticalpatent/FR498829A/fr
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/26—Devices for calling a subscriber
H04M1/30—Devices which can set up and transmit only one digit at a time
H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR498829D1918-03-061919-03-06Perfectionnements aux dispositifs de transmission d'impulsions de courant pour systèmes téléphoniques
ExpiredFR498829A
(fr)