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Publication of FR753605ApublicationCriticalpatent/FR753605A/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
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Signal Processing
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Telephone Set Structure
(AREA)
FR753605D1932-04-011933-04-01Dispositif de manceuvre pour appareils téléphoniques automatiques
ExpiredFR753605A
(fr)