GB355182A - Improvements in switching arrangements for telephone systems - Google Patents

Improvements in switching arrangements for telephone systems

Info

Publication number
GB355182A
GB355182A GB8513/31A GB851331A GB355182A GB 355182 A GB355182 A GB 355182A GB 8513/31 A GB8513/31 A GB 8513/31A GB 851331 A GB851331 A GB 851331A GB 355182 A GB355182 A GB 355182A
Authority
GB
United Kingdom
Prior art keywords
microphone
relay
prepayment
svr
stockholm
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
GB8513/31A
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 GB355182A publication Critical patent/GB355182A/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)
  • Telephonic Communication Services (AREA)
  • Prepayment Telephone Systems (AREA)
GB8513/31A 1930-03-21 1931-03-19 Improvements in switching arrangements for telephone systems Expired GB355182A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB355182A true GB355182A (en) 1931-08-20

Family

ID=20308759

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8513/31A Expired GB355182A (en) 1930-03-21 1931-03-19 Improvements in switching arrangements for telephone systems

Country Status (5)

Country Link
US (1) US1855074A (en(2012))
BE (1) BE378411A (en(2012))
DE (1) DE552018C (en(2012))
FR (1) FR713495A (en(2012))
GB (1) GB355182A (en(2012))

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
FR713495A (fr) 1931-10-28
DE552018C (de) 1932-06-08
US1855074A (en) 1932-04-19
BE378411A (en(2012))

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