NL7308862A - - Google Patents

Info

Publication number
NL7308862A
NL7308862A NL7308862A NL7308862A NL7308862A NL 7308862 A NL7308862 A NL 7308862A NL 7308862 A NL7308862 A NL 7308862A NL 7308862 A NL7308862 A NL 7308862A NL 7308862 A NL7308862 A NL 7308862A
Authority
NL
Netherlands
Application number
NL7308862A
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 NL7308862A publication Critical patent/NL7308862A/xx

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)
NL7308862A 1972-06-26 1973-06-26 NL7308862A (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
NL7308862A true NL7308862A (enrdf_load_stackoverflow) 1973-12-28

Family

ID=23014788

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7308862A NL7308862A (enrdf_load_stackoverflow) 1972-06-26 1973-06-26

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)

Families Citing this family (7)

* 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
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

Family Cites Families (3)

* 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
JPS4831810A (enrdf_load_stackoverflow) * 1971-08-30 1973-04-26

Also Published As

Publication number Publication date
IT986215B (it) 1975-01-20
JPS4952506A (enrdf_load_stackoverflow) 1974-05-22
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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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
A85 Still pending on 85-01-01
BV The patent application has lapsed