GB374952A - Improvements in switching arrangements for telephone systems - Google Patents

Improvements in switching arrangements for telephone systems

Info

Publication number
GB374952A
GB374952A GB8514/31A GB851431A GB374952A GB 374952 A GB374952 A GB 374952A GB 8514/31 A GB8514/31 A GB 8514/31A GB 851431 A GB851431 A GB 851431A GB 374952 A GB374952 A GB 374952A
Authority
GB
United Kingdom
Prior art keywords
relay
energizes
svr
prepayment
eor
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
GB8514/31A
Other languages
English (en)
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
Publication of GB374952A publication Critical patent/GB374952A/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)
  • Interface Circuits In Exchanges (AREA)
  • Prepayment Telephone Systems (AREA)
  • Meter Arrangements (AREA)
GB8514/31A 1930-03-21 1931-03-19 Improvements in switching arrangements for telephone systems Expired GB374952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE374952X 1930-03-21

Publications (1)

Publication Number Publication Date
GB374952A true GB374952A (en) 1932-06-20

Family

ID=20309104

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8514/31A Expired GB374952A (en) 1930-03-21 1931-03-19 Improvements in switching arrangements for telephone systems

Country Status (5)

Country Link
US (1) US1868378A (ja)
BE (1) BE378412A (ja)
DE (1) DE610040C (ja)
FR (1) FR713496A (ja)
GB (1) GB374952A (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707724A (en) * 1952-10-07 1955-05-03 Automatic Elect Lab Coin control circuit for postpay telephone paystations

Also Published As

Publication number Publication date
BE378412A (ja)
FR713496A (fr) 1931-10-28
DE610040C (de) 1935-03-05
US1868378A (en) 1932-07-19

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