IT986215B - Perfezionamento nelle segretarie telefoniche automatiche - Google Patents

Perfezionamento nelle segretarie telefoniche automatiche

Info

Publication number
IT986215B
IT986215B IT5102273A IT5102273A IT986215B IT 986215 B IT986215 B IT 986215B IT 5102273 A IT5102273 A IT 5102273A IT 5102273 A IT5102273 A IT 5102273A IT 986215 B IT986215 B IT 986215B
Authority
IT
Italy
Prior art keywords
secretaries
improvement
automatic telephone
telephone
automatic
Prior art date
Application number
IT5102273A
Other languages
English (en)
Italian (it)
Inventor
J Kilby
Original Assignee
J Kilby
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 J Kilby filed Critical J Kilby
Application granted granted Critical
Publication of IT986215B publication Critical patent/IT986215B/it

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)
IT5102273A 1972-06-26 1973-06-25 Perfezionamento nelle segretarie telefoniche automatiche IT986215B (it)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
IT986215B true IT986215B (it) 1975-01-20

Family

ID=23014788

Family Applications (1)

Application Number Title Priority Date Filing Date
IT5102273A IT986215B (it) 1972-06-26 1973-06-25 Perfezionamento nelle segretarie telefoniche automatiche

Country Status (8)

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

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 (de) * 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 (de) * 1971-08-30 1973-04-26

Also Published As

Publication number Publication date
JPS4952506A (de) 1974-05-22
CA984983A (en) 1976-03-02
BE801478A (fr) 1973-10-15
DE2332244C2 (de) 1984-04-05
SE382293B (sv) 1976-01-19
GB1432983A (en) 1976-04-22
NL7308862A (de) 1973-12-28
DE2332244A1 (de) 1974-01-17

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