IT1011800B - ELECTRONIC KEYPAD COMBINATOR FOR TELEPHONE DEVICES - Google Patents

ELECTRONIC KEYPAD COMBINATOR FOR TELEPHONE DEVICES

Info

Publication number
IT1011800B
IT1011800B IT6833474A IT6833474A IT1011800B IT 1011800 B IT1011800 B IT 1011800B IT 6833474 A IT6833474 A IT 6833474A IT 6833474 A IT6833474 A IT 6833474A IT 1011800 B IT1011800 B IT 1011800B
Authority
IT
Italy
Prior art keywords
combinator
telephone devices
electronic keypad
keypad
electronic
Prior art date
Application number
IT6833474A
Other languages
Italian (it)
Original Assignee
Deutsche Fernsprecher 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
Priority claimed from DE19732321897 external-priority patent/DE2321897C3/en
Priority claimed from DE19732321794 external-priority patent/DE2321794B2/en
Application filed by Deutsche Fernsprecher Gmbh filed Critical Deutsche Fernsprecher Gmbh
Application granted granted Critical
Publication of IT1011800B publication Critical patent/IT1011800B/en

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
    • H04M1/312—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 pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
IT6833474A 1973-04-30 1974-04-29 ELECTRONIC KEYPAD COMBINATOR FOR TELEPHONE DEVICES IT1011800B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732321897 DE2321897C3 (en) 1973-04-30 Circuit arrangement for deriving a small DC voltage occurring as a voltage drop in a current-carrying loop
DE19732321794 DE2321794B2 (en) 1973-04-30 1973-04-30 Touch-dial number switch for telephone subscriber sets

Publications (1)

Publication Number Publication Date
IT1011800B true IT1011800B (en) 1977-02-10

Family

ID=25765065

Family Applications (1)

Application Number Title Priority Date Filing Date
IT6833474A IT1011800B (en) 1973-04-30 1974-04-29 ELECTRONIC KEYPAD COMBINATOR FOR TELEPHONE DEVICES

Country Status (4)

Country Link
AT (1) AT339382B (en)
FR (1) FR2227696B1 (en)
IT (1) IT1011800B (en)
NL (1) NL7405798A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7608076L (en) * 1975-07-25 1977-01-26 Carlo Baldoni TEN NUMBER PROVIDED, DIGITAL NUMBER RECEIVER OF KEY TYPE

Also Published As

Publication number Publication date
FR2227696A1 (en) 1974-11-22
ATA341974A (en) 1977-02-15
NL7405798A (en) 1974-11-01
FR2227696B1 (en) 1980-08-29
AT339382B (en) 1977-10-10

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