FR713495A - Improvements to switching devices for telephone systems - Google Patents

Improvements to switching devices for telephone systems

Info

Publication number
FR713495A
FR713495A FR713495DA FR713495A FR 713495 A FR713495 A FR 713495A FR 713495D A FR713495D A FR 713495DA FR 713495 A FR713495 A FR 713495A
Authority
FR
France
Prior art keywords
switching devices
telephone systems
telephone
systems
switching
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
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR713495A publication Critical patent/FR713495A/en
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
    • H04M17/023—Circuit arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Prepayment Telephone Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
FR713495D 1930-03-21 1931-03-18 Improvements to switching devices for telephone systems Expired FR713495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE355182X 1930-03-21

Publications (1)

Publication Number Publication Date
FR713495A true FR713495A (en) 1931-10-28

Family

ID=20308759

Family Applications (1)

Application Number Title Priority Date Filing Date
FR713495D Expired FR713495A (en) 1930-03-21 1931-03-18 Improvements to switching devices for telephone systems

Country Status (5)

Country Link
US (1) US1855074A (en)
BE (1) BE378411A (en)
DE (1) DE552018C (en)
FR (1) FR713495A (en)
GB (1) GB355182A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB529650A (en) * 1939-05-24 1940-11-26 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
US2519867A (en) * 1947-05-22 1950-08-22 Automatic Elect Lab Restricted service telephone system
US3474193A (en) * 1967-02-01 1969-10-21 Northern Electric Co Postpay telephone paystation circuit

Also Published As

Publication number Publication date
GB355182A (en) 1931-08-20
DE552018C (en) 1932-06-08
BE378411A (en)
US1855074A (en) 1932-04-19

Similar Documents

Publication Publication Date Title
FR713495A (en) Improvements to switching devices for telephone systems
FR713496A (en) Improvements to switching devices for telephone systems
FR713494A (en) Improvements to switching devices for telephone systems
FR788463A (en) Auxiliary installation for telephone devices
FR701999A (en) Improvements to switching devices
FR717840A (en) Improvements to telephone installations
FR713774A (en) Switching device improvements
FR693082A (en) Improvements to switches for signaling devices
FR681159A (en) Improvements to switching devices for automatic or semi-automatic telephone systems
FR729974A (en) Disconnect switch for electrical installations
FR623088A (en) Improvements to switches for automatic telephone systems
FR713878A (en) Number switch for telephone devices
FR597821A (en) Improvements to switching devices for large networks
FR722549A (en) Switching device for electrical devices
FR725250A (en) Coupling arrangement for telephone systems
FR704588A (en) Switching device for telephone systems
FR639152A (en) Improvements to selector switches for telephone installations
FR721012A (en) Mounting for battery-switched telegraph devices
FR722028A (en) Improvements to protection systems for electrical circuits
FR714379A (en) Improvements to armored stations for electrical installations
FR817756A (en) Switching device for telegraph installations
FR693080A (en) Improvements to switches for signaling devices
FR711614A (en) Coupling arrangement for telephone systems
FR711615A (en) Coupling arrangement for telephone systems
FR711801A (en) Coupling arrangement for telephone systems