FR15212E - Switch for telephone systems - Google Patents

Switch for telephone systems

Info

Publication number
FR15212E
FR15212E FR15212A FR15212DA FR15212E FR 15212 E FR15212 E FR 15212E FR 15212 A FR15212 A FR 15212A FR 15212D A FR15212D A FR 15212DA FR 15212 E FR15212 E FR 15212E
Authority
FR
France
Prior art keywords
switch
telephone systems
telephone
systems
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
FR15212A
Other languages
French (fr)
Inventor
Franz-Schulz
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.)
Individual
Original Assignee
Individual
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.)
Publication date
Application granted granted Critical
Publication of FR15212E publication Critical patent/FR15212E/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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR15212A 1911-06-02 Switch for telephone systems Expired FR15212E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE432237X 1911-06-02

Publications (1)

Publication Number Publication Date
FR15212E true FR15212E (en) 1912-05-22

Family

ID=8650352

Family Applications (2)

Application Number Title Priority Date Filing Date
FR15212A Expired FR15212E (en) 1911-06-02 Switch for telephone systems
FR432237A Expired FR432237A (en) 1911-06-02 1911-06-24 Switch for telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR432237A Expired FR432237A (en) 1911-06-02 1911-06-24 Switch for telephone systems

Country Status (1)

Country Link
FR (2) FR432237A (en)

Also Published As

Publication number Publication date
FR432237A (en) 1911-12-01

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