GB1051285A - - Google Patents

Info

Publication number
GB1051285A
GB1051285A GB1051285DA GB1051285A GB 1051285 A GB1051285 A GB 1051285A GB 1051285D A GB1051285D A GB 1051285DA GB 1051285 A GB1051285 A GB 1051285A
Authority
GB
United Kingdom
Prior art keywords
ringer
ringing current
line
circuit
april
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
Other languages
English (en)
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 of GB1051285A publication Critical patent/GB1051285A/en
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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Meter Arrangements (AREA)
GB1051285D 1964-04-30 Active GB1051285A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964ST022060 DE1265214B (de) 1964-04-30 1964-04-30 Schaltungsanordnung fuer Fernsprechapparate zur Verhinderung des Abhoerens von Gespraechen

Publications (1)

Publication Number Publication Date
GB1051285A true GB1051285A (enrdf_load_stackoverflow)

Family

ID=7459221

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1051285D Active GB1051285A (enrdf_load_stackoverflow) 1964-04-30

Country Status (2)

Country Link
DE (1) DE1265214B (enrdf_load_stackoverflow)
GB (1) GB1051285A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715514A (en) * 1970-10-07 1973-02-06 Dektor Counterintelligence And Telephone security device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1153424B (de) * 1961-10-23 1963-08-29 Krone Kg Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen bei Fernsprechapparaten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715514A (en) * 1970-10-07 1973-02-06 Dektor Counterintelligence And Telephone security device

Also Published As

Publication number Publication date
DE1265214B (de) 1968-04-04

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