FR868947A - Dispositif de détermination de zone, dans les installations téléphoniques - Google Patents

Dispositif de détermination de zone, dans les installations téléphoniques

Info

Publication number
FR868947A
FR868947A FR868947DA FR868947A FR 868947 A FR868947 A FR 868947A FR 868947D A FR868947D A FR 868947DA FR 868947 A FR868947 A FR 868947A
Authority
FR
France
Prior art keywords
determination device
zone determination
telephone installations
installations
telephone
Prior art date
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.)
Expired
Application number
Other languages
English (en)
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telephon Apparat Fabrik E Zwietusch and Co
Original Assignee
Telephon Apparat Fabrik E Zwietusch and Co
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 Telephon Apparat Fabrik E Zwietusch and Co filed Critical Telephon Apparat Fabrik E Zwietusch and Co
Application granted granted Critical
Publication of FR868947A publication Critical patent/FR868947A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • 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
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
FR868947D 1939-11-12 1940-12-31 Dispositif de détermination de zone, dans les installations téléphoniques Expired FR868947A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET53058D DE719605C (de) 1939-11-12 1939-11-12 Zonenbestimmer in Fernsprechanlagen, insbesondere zur Gebuehrenkontrolle in Muenzfernsprechern mit Netzgruppenverkehr

Publications (1)

Publication Number Publication Date
FR868947A true FR868947A (fr) 1942-01-20

Family

ID=5832087

Family Applications (1)

Application Number Title Priority Date Filing Date
FR868947D Expired FR868947A (fr) 1939-11-12 1940-12-31 Dispositif de détermination de zone, dans les installations téléphoniques

Country Status (5)

Country Link
BE (1) BE439701A (en, 2012)
CH (1) CH219811A (en, 2012)
DE (1) DE719605C (en, 2012)
FR (1) FR868947A (en, 2012)
NL (1) NL54342C (en, 2012)

Also Published As

Publication number Publication date
DE719605C (de) 1942-04-23
BE439701A (en, 2012) 1940-12-31
NL54342C (en, 2012) 1943-04-15
CH219811A (de) 1942-02-28

Similar Documents

Publication Publication Date Title
CH233992A (fr) Dispositif électro-acoustique.
FR938296A (fr) Dispositif téléphonique
FR871809A (fr) Ferme-porte avec dispositif supplémentaire de poussée
CH216786A (de) Kontaktvorrichtung.
FR862511A (fr) Dispositif de nettoyage
FR864401A (fr) Dispositif fixe-compresses
FR868947A (fr) Dispositif de détermination de zone, dans les installations téléphoniques
FR886262A (fr) Dispositif de modulateur
FR848558A (fr) Dispositif de bouchage
CH215519A (de) Analgesiegerät.
FR861377A (fr) Dispositif perfectionné de joint pour tuyauteries
FR856054A (fr) Dispositif de propulsion
FR938800A (fr) Dispositif téléphonique
FR857582A (fr) Dispositif de radioalignement
FR850468A (fr) Dispositif de raccordement de tuyaux
FR864213A (fr) Dispositif de sauvetage
FR865327A (fr) Dispositif de graissage
FR849668A (fr) Dispositif de publicité mobile
FR861856A (fr) Dispositif inverseur de marche
FR866718A (fr) Dispositif de transmission
ES6725Y (es) Dispositivo horizontal de líquido.
FR938489A (fr) Dispositif avertisseur
FR851664A (fr) Dispositif de dégazage
FR904305A (fr) Dispositif de filtration
CH233989A (fr) Dispositif télégraphique.