JPS4952506A - - Google Patents

Info

Publication number
JPS4952506A
JPS4952506A JP7160573A JP7160573A JPS4952506A JP S4952506 A JPS4952506 A JP S4952506A JP 7160573 A JP7160573 A JP 7160573A JP 7160573 A JP7160573 A JP 7160573A JP S4952506 A JPS4952506 A JP S4952506A
Authority
JP
Japan
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.)
Pending
Application number
JP7160573A
Other languages
Japanese (ja)
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 filed Critical
Publication of JPS4952506A publication Critical patent/JPS4952506A/ja
Pending 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
    • H04M1/66—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)
  • Telephonic Communication Services (AREA)
  • Prepayment Telephone Systems (AREA)
JP7160573A 1972-06-26 1973-06-25 Pending JPS4952506A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26649072A 1972-06-26 1972-06-26

Publications (1)

Publication Number Publication Date
JPS4952506A true JPS4952506A (enrdf_load_stackoverflow) 1974-05-22

Family

ID=23014788

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7160573A Pending JPS4952506A (enrdf_load_stackoverflow) 1972-06-26 1973-06-25

Country Status (8)

Country Link
JP (1) JPS4952506A (enrdf_load_stackoverflow)
BE (1) BE801478A (enrdf_load_stackoverflow)
CA (1) CA984983A (enrdf_load_stackoverflow)
DE (1) DE2332244C2 (enrdf_load_stackoverflow)
GB (1) GB1432983A (enrdf_load_stackoverflow)
IT (1) IT986215B (enrdf_load_stackoverflow)
NL (1) NL7308862A (enrdf_load_stackoverflow)
SE (1) SE382293B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399802A (en) * 1977-02-14 1978-08-31 Nippon Telegr & Teleph Corp <Ntt> Specific subscriber calling equipment of automatic answering telephone set
JPS53132911A (en) * 1977-04-26 1978-11-20 Iwatsu Electric Co Ltd Telephone set
JPS53146511A (en) * 1977-05-26 1978-12-20 Toyo Communication Equip Caller identifying telephone set
JPS5648160U (enrdf_load_stackoverflow) * 1980-09-04 1981-04-28

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405014A1 (de) * 1984-02-13 1985-08-14 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Verfahren fuer den betrieb eines telefon-anrufbeantworters
GB2183125B (en) * 1985-10-10 1989-11-29 Microcompass Ltd Improvements to communication apparatus
DE19511622A1 (de) 1995-03-30 1996-10-02 Michael Wolf Türrufbeantworter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831810A (enrdf_load_stackoverflow) * 1971-08-30 1973-04-26

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1283074A (fr) * 1961-03-08 1962-01-27 Installation téléphonique d'abonné
DE1437906B2 (de) * 1965-04-17 1970-03-26 Blessing, Dipl.-Kfm. Dr. Gerhard, 7336 Uhingen Schaltungsanordnung für eine Zusatzeinrichtung an Fernsprechteilnehmerstellen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831810A (enrdf_load_stackoverflow) * 1971-08-30 1973-04-26

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399802A (en) * 1977-02-14 1978-08-31 Nippon Telegr & Teleph Corp <Ntt> Specific subscriber calling equipment of automatic answering telephone set
JPS53132911A (en) * 1977-04-26 1978-11-20 Iwatsu Electric Co Ltd Telephone set
JPS53146511A (en) * 1977-05-26 1978-12-20 Toyo Communication Equip Caller identifying telephone set
JPS5648160U (enrdf_load_stackoverflow) * 1980-09-04 1981-04-28

Also Published As

Publication number Publication date
IT986215B (it) 1975-01-20
NL7308862A (enrdf_load_stackoverflow) 1973-12-28
GB1432983A (en) 1976-04-22
DE2332244A1 (de) 1974-01-17
DE2332244C2 (de) 1984-04-05
SE382293B (sv) 1976-01-19
CA984983A (en) 1976-03-02
BE801478A (fr) 1973-10-15

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