BE744748A - Circuit selectif - Google Patents

Circuit selectif

Info

Publication number
BE744748A
BE744748A BE744748DA BE744748A BE 744748 A BE744748 A BE 744748A BE 744748D A BE744748D A BE 744748DA BE 744748 A BE744748 A BE 744748A
Authority
BE
Belgium
Prior art keywords
selective circuit
selective
circuit
Prior art date
Application number
Other languages
English (en)
French (fr)
Original Assignee
Haas Johannes G
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 Haas Johannes G filed Critical Haas Johannes G
Publication of BE744748A publication Critical patent/BE744748A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
BE744748D 1969-01-21 1970-01-21 Circuit selectif BE744748A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6900963A NL6900963A (cs) 1969-01-21 1969-01-21

Publications (1)

Publication Number Publication Date
BE744748A true BE744748A (fr) 1970-07-01

Family

ID=19805922

Family Applications (1)

Application Number Title Priority Date Filing Date
BE744748D BE744748A (fr) 1969-01-21 1970-01-21 Circuit selectif

Country Status (6)

Country Link
BE (1) BE744748A (cs)
CH (1) CH527530A (cs)
DE (1) DE2002160A1 (cs)
FR (1) FR2028833A1 (cs)
GB (1) GB1306701A (cs)
NL (1) NL6900963A (cs)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793487A (en) * 1971-11-22 1974-02-19 J Kilby System for screening telephone calls
JPS62163445A (ja) * 1986-01-14 1987-07-20 Mitsubishi Electric Corp 電話切換装置

Also Published As

Publication number Publication date
DE2002160A1 (de) 1970-09-03
GB1306701A (en) 1973-02-14
NL6900963A (cs) 1970-07-23
FR2028833A1 (cs) 1970-10-16
CH527530A (de) 1972-08-31

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