FR715711A - Coupling device for telephone systems - Google Patents

Coupling device for telephone systems

Info

Publication number
FR715711A
FR715711A FR715711DA FR715711A FR 715711 A FR715711 A FR 715711A FR 715711D A FR715711D A FR 715711DA FR 715711 A FR715711 A FR 715711A
Authority
FR
France
Prior art keywords
coupling device
telephone systems
telephone
systems
coupling
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens and Halske AG
Siemens Corp
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 Siemens and Halske AG, Siemens Corp filed Critical Siemens and Halske AG
Application granted granted Critical
Publication of FR715711A publication Critical patent/FR715711A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR715711D 1931-03-16 1931-04-20 Coupling device for telephone systems Expired FR715711A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE715711X 1931-03-16

Publications (1)

Publication Number Publication Date
FR715711A true FR715711A (en) 1931-12-08

Family

ID=6626263

Family Applications (1)

Application Number Title Priority Date Filing Date
FR715711D Expired FR715711A (en) 1931-03-16 1931-04-20 Coupling device for telephone systems

Country Status (1)

Country Link
FR (1) FR715711A (en)

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