GB1360500A - Telephone instruments - Google Patents

Telephone instruments

Info

Publication number
GB1360500A
GB1360500A GB3991271A GB3991271A GB1360500A GB 1360500 A GB1360500 A GB 1360500A GB 3991271 A GB3991271 A GB 3991271A GB 3991271 A GB3991271 A GB 3991271A GB 1360500 A GB1360500 A GB 1360500A
Authority
GB
United Kingdom
Prior art keywords
oscillator
line
wire
capacitor
tone
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
GB3991271A
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB3991271A priority Critical patent/GB1360500A/en
Priority to FR7230058A priority patent/FR2151365A5/fr
Priority to NL7211528A priority patent/NL7211528A/xx
Priority to DE19722241725 priority patent/DE2241725A1/de
Priority to JP8521872A priority patent/JPS4831009A/ja
Publication of GB1360500A publication Critical patent/GB1360500A/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
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Prepayment Telephone Systems (AREA)
  • Meter Arrangements (AREA)
GB3991271A 1971-08-25 1971-08-25 Telephone instruments Expired GB1360500A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB3991271A GB1360500A (en) 1971-08-25 1971-08-25 Telephone instruments
FR7230058A FR2151365A5 (cg-RX-API-DMAC7.html) 1971-08-25 1972-08-23
NL7211528A NL7211528A (cg-RX-API-DMAC7.html) 1971-08-25 1972-08-24
DE19722241725 DE2241725A1 (de) 1971-08-25 1972-08-25 Fernsprechapparat
JP8521872A JPS4831009A (cg-RX-API-DMAC7.html) 1971-08-25 1972-08-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3991271A GB1360500A (en) 1971-08-25 1971-08-25 Telephone instruments

Publications (1)

Publication Number Publication Date
GB1360500A true GB1360500A (en) 1974-07-17

Family

ID=10412156

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3991271A Expired GB1360500A (en) 1971-08-25 1971-08-25 Telephone instruments

Country Status (5)

Country Link
JP (1) JPS4831009A (cg-RX-API-DMAC7.html)
DE (1) DE2241725A1 (cg-RX-API-DMAC7.html)
FR (1) FR2151365A5 (cg-RX-API-DMAC7.html)
GB (1) GB1360500A (cg-RX-API-DMAC7.html)
NL (1) NL7211528A (cg-RX-API-DMAC7.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207701A (ja) * 1983-05-11 1984-11-24 Hokuriku Electric Power Co Inc:The パラボラ型アンテナの着雪防止装置
US8659490B2 (en) 2009-01-15 2014-02-25 William D. Walton Apparatus and method for clearing water from dish antenna covers

Also Published As

Publication number Publication date
FR2151365A5 (cg-RX-API-DMAC7.html) 1973-04-13
NL7211528A (cg-RX-API-DMAC7.html) 1973-02-27
DE2241725A1 (de) 1973-03-08
JPS4831009A (cg-RX-API-DMAC7.html) 1973-04-24

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees