DE297265C - - Google Patents

Info

Publication number
DE297265C
DE297265C DENDAT297265D DE297265DA DE297265C DE 297265 C DE297265 C DE 297265C DE NDAT297265 D DENDAT297265 D DE NDAT297265D DE 297265D A DE297265D A DE 297265DA DE 297265 C DE297265 C DE 297265C
Authority
DE
Germany
Prior art keywords
electromagnet
line
battery
telephone line
connection
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
DENDAT297265D
Other languages
German (de)
English (en)
Publication of DE297265C publication Critical patent/DE297265C/de
Active 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)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
DENDAT297265D Active DE297265C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE301083T

Publications (1)

Publication Number Publication Date
DE297265C true DE297265C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family

ID=6097847

Family Applications (2)

Application Number Title Priority Date Filing Date
DENDAT297265D Active DE297265C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DENDAT301083D Active DE301083C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family Applications After (1)

Application Number Title Priority Date Filing Date
DENDAT301083D Active DE301083C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Country Status (1)

Country Link
DE (2) DE301083C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
DE301083C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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