GB490660A - Improvements in and relating to coin freed telephone installations - Google Patents

Improvements in and relating to coin freed telephone installations

Info

Publication number
GB490660A
GB490660A GB31355/36A GB3135536A GB490660A GB 490660 A GB490660 A GB 490660A GB 31355/36 A GB31355/36 A GB 31355/36A GB 3135536 A GB3135536 A GB 3135536A GB 490660 A GB490660 A GB 490660A
Authority
GB
United Kingdom
Prior art keywords
relay
coins
contact
impulses
call
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
GB31355/36A
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.)
Friedrich Merk Telefonbau GmbH
Original Assignee
Friedrich Merk Telefonbau GmbH
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 Friedrich Merk Telefonbau GmbH filed Critical Friedrich Merk Telefonbau GmbH
Publication of GB490660A publication Critical patent/GB490660A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)
GB31355/36A 1935-11-14 1936-11-16 Improvements in and relating to coin freed telephone installations Expired GB490660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE490660X 1935-11-14

Publications (1)

Publication Number Publication Date
GB490660A true GB490660A (en) 1938-08-16

Family

ID=6544142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31355/36A Expired GB490660A (en) 1935-11-14 1936-11-16 Improvements in and relating to coin freed telephone installations

Country Status (4)

Country Link
BE (1) BE418363A (enrdf_load_stackoverflow)
FR (1) FR813238A (enrdf_load_stackoverflow)
GB (1) GB490660A (enrdf_load_stackoverflow)
NL (1) NL44678C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL44678C (enrdf_load_stackoverflow)
BE418363A (enrdf_load_stackoverflow)
FR813238A (fr) 1937-05-28

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