FR713878A - Number switch for telephone devices - Google Patents

Number switch for telephone devices

Info

Publication number
FR713878A
FR713878A FR713878DA FR713878A FR 713878 A FR713878 A FR 713878A FR 713878D A FR713878D A FR 713878DA FR 713878 A FR713878 A FR 713878A
Authority
FR
France
Prior art keywords
telephone devices
number switch
switch
telephone
devices
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.)
Telephon Apparat Fabrik E Zwietusch and Co
Original Assignee
Telephon Apparat Fabrik E Zwietusch and Co
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 Telephon Apparat Fabrik E Zwietusch and Co filed Critical Telephon Apparat Fabrik E Zwietusch and Co
Application granted granted Critical
Publication of FR713878A publication Critical patent/FR713878A/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
    • H04M1/32—Locking setting devices during transmission to prevent interference by user

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Keying Circuit Devices (AREA)
  • Telephone Set Structure (AREA)
FR713878D 1930-07-08 1931-03-26 Number switch for telephone devices Expired FR713878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE579407T 1930-07-08

Publications (1)

Publication Number Publication Date
FR713878A true FR713878A (en) 1931-11-04

Family

ID=34584667

Family Applications (1)

Application Number Title Priority Date Filing Date
FR713878D Expired FR713878A (en) 1930-07-08 1931-03-26 Number switch for telephone devices

Country Status (4)

Country Link
DE (1) DE579407C (en)
FR (1) FR713878A (en)
GB (1) GB359852A (en)
NL (1) NL31271C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007815B (en) * 1951-12-26 1957-05-09 Lorenz C Ag Number switch for telephones with an inertia contact controlled by the spindle

Also Published As

Publication number Publication date
GB359852A (en) 1931-10-29
NL31271C (en)
DE579407C (en) 1933-06-26

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