FR1142802A - Improvements to call dials used in automatic telephony - Google Patents

Improvements to call dials used in automatic telephony

Info

Publication number
FR1142802A
FR1142802A FR1142802DA FR1142802A FR 1142802 A FR1142802 A FR 1142802A FR 1142802D A FR1142802D A FR 1142802DA FR 1142802 A FR1142802 A FR 1142802A
Authority
FR
France
Prior art keywords
automatic telephony
call dials
dials used
call
telephony
Prior art date
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.)
Expired
Application number
Other languages
French (fr)
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.)
CELEC
Original Assignee
CELEC
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 CELEC filed Critical CELEC
Application granted granted Critical
Publication of FR1142802A publication Critical patent/FR1142802A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR1142802D 1956-03-07 1956-03-07 Improvements to call dials used in automatic telephony Expired FR1142802A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1142802T 1956-03-07

Publications (1)

Publication Number Publication Date
FR1142802A true FR1142802A (en) 1957-09-23

Family

ID=9643548

Family Applications (2)

Application Number Title Priority Date Filing Date
FR1142802D Expired FR1142802A (en) 1956-03-07 1956-03-07 Improvements to call dials used in automatic telephony
FR7025A Expired FR78624E (en) 1956-03-07 1960-10-29 Improvements to call dials used in automatic telephony

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR7025A Expired FR78624E (en) 1956-03-07 1960-10-29 Improvements to call dials used in automatic telephony

Country Status (1)

Country Link
FR (2) FR1142802A (en)

Also Published As

Publication number Publication date
FR78624E (en) 1962-08-17

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