CH397783A - Circuit arrangement to prevent eavesdropping on conversations on a telephone set ready for call - Google Patents

Circuit arrangement to prevent eavesdropping on conversations on a telephone set ready for call

Info

Publication number
CH397783A
CH397783A CH1232862A CH1232862A CH397783A CH 397783 A CH397783 A CH 397783A CH 1232862 A CH1232862 A CH 1232862A CH 1232862 A CH1232862 A CH 1232862A CH 397783 A CH397783 A CH 397783A
Authority
CH
Switzerland
Prior art keywords
conversations
call
circuit arrangement
telephone set
set ready
Prior art date
Application number
CH1232862A
Other languages
German (de)
Inventor
Hoppe Hans
Erich Dipl Ing Paravicini
Original Assignee
Krone Kg
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 Krone Kg filed Critical Krone Kg
Publication of CH397783A publication Critical patent/CH397783A/en

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)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Devices For Supply Of Signal Current (AREA)
CH1232862A 1961-11-22 1962-10-18 Circuit arrangement to prevent eavesdropping on conversations on a telephone set ready for call CH397783A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEK0045268 1961-11-22
DEK45632A DE1259392B (en) 1961-11-22 1962-01-11 Circuit arrangement to prevent eavesdropping on conversations in telephone sets

Publications (1)

Publication Number Publication Date
CH397783A true CH397783A (en) 1965-08-31

Family

ID=25983500

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1232862A CH397783A (en) 1961-11-22 1962-10-18 Circuit arrangement to prevent eavesdropping on conversations on a telephone set ready for call

Country Status (6)

Country Link
BE (1) BE624666A (en)
CH (1) CH397783A (en)
DE (1) DE1259392B (en)
FR (1) FR1339246A (en)
GB (1) GB995025A (en)
NL (1) NL285759A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3308986C2 (en) * 1983-03-14 1986-02-27 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for a digital telephone station
DE3308984C2 (en) * 1983-03-14 1986-02-27 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for a digital telephone station

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066624B (en) * 1959-10-08 Telefonbau und Normalzeit G.m. b.H., Frankfurt/M Formwork arrangement to prevent eavesdropping on conversations

Also Published As

Publication number Publication date
FR1339246A (en) 1963-10-04
NL285759A (en)
GB995025A (en) 1965-06-10
BE624666A (en)
DE1259392B (en) 1968-01-25

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