FR432237A - Switch for telephone systems - Google Patents

Switch for telephone systems

Info

Publication number
FR432237A
FR432237A FR432237A FR432237DA FR432237A FR 432237 A FR432237 A FR 432237A FR 432237 A FR432237 A FR 432237A FR 432237D A FR432237D A FR 432237DA FR 432237 A FR432237 A FR 432237A
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
FR432237A
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of FR432237A publication Critical patent/FR432237A/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)
FR432237A 1911-06-02 1911-06-24 Switch for telephone systems Expired FR432237A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
FR432237A true FR432237A (en) 1911-12-01

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 Before (1)

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

Country Status (1)

Country Link
FR (2) FR432237A (en)

Also Published As

Publication number Publication date
FR15212E (en) 1912-05-22

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