GB1259451A - - Google Patents

Info

Publication number
GB1259451A
GB1259451A GB1259451DA GB1259451A GB 1259451 A GB1259451 A GB 1259451A GB 1259451D A GB1259451D A GB 1259451DA GB 1259451 A GB1259451 A GB 1259451A
Authority
GB
United Kingdom
Prior art keywords
sounder
tone
handset
diaphragm
armature
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
English (en)
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 filed Critical
Publication of GB1259451A publication Critical patent/GB1259451A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB1259451D 1967-11-29 1967-11-29 Expired GB1259451A (https=)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5432567 1967-11-29

Publications (1)

Publication Number Publication Date
GB1259451A true GB1259451A (https=) 1972-01-05

Family

ID=10470633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1259451D Expired GB1259451A (https=) 1967-11-29 1967-11-29

Country Status (1)

Country Link
GB (1) GB1259451A (https=)

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee