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)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (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 (cg-RX-API-DMAC7.html) 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 (cg-RX-API-DMAC7.html)
CH (1) CH527530A (cg-RX-API-DMAC7.html)
DE (1) DE2002160A1 (cg-RX-API-DMAC7.html)
FR (1) FR2028833A1 (cg-RX-API-DMAC7.html)
GB (1) GB1306701A (cg-RX-API-DMAC7.html)
NL (1) NL6900963A (cg-RX-API-DMAC7.html)

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
NL6900963A (cg-RX-API-DMAC7.html) 1970-07-23
GB1306701A (en) 1973-02-14
CH527530A (de) 1972-08-31
DE2002160A1 (de) 1970-09-03
FR2028833A1 (cg-RX-API-DMAC7.html) 1970-10-16

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