DE176405C - - Google Patents

Info

Publication number
DE176405C
DE176405C DENDAT176405D DE176405DA DE176405C DE 176405 C DE176405 C DE 176405C DE NDAT176405 D DENDAT176405 D DE NDAT176405D DE 176405D A DE176405D A DE 176405DA DE 176405 C DE176405 C DE 176405C
Authority
DE
Germany
Prior art keywords
relay
plug
office
circuit
lines
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.)
Active
Application number
DENDAT176405D
Other languages
German (de)
English (en)
Publication of DE176405C publication Critical patent/DE176405C/de
Active legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/68Circuit arrangements for preventing eavesdropping
    • H04M1/70Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
DENDAT176405D Active DE176405C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Publications (1)

Publication Number Publication Date
DE176405C true DE176405C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family

ID=440974

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT176405D Active DE176405C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Country Status (1)

Country Link
DE (1) DE176405C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE920369C (de) * 1941-06-24 1954-11-22 Siemens Ag Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb, bei denen ueber die gleichen Leitungswaehler verschiedenwertige Verbindungen zu verschieden berechtigten Anschlussstellen hergestellt werden

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE920369C (de) * 1941-06-24 1954-11-22 Siemens Ag Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb, bei denen ueber die gleichen Leitungswaehler verschiedenwertige Verbindungen zu verschieden berechtigten Anschlussstellen hergestellt werden

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