GB191302022A - Improvements in or relating to Telephonic Systems, - Google Patents

Improvements in or relating to Telephonic Systems,

Info

Publication number
GB191302022A
GB191302022A GB191302022DA GB191302022A GB 191302022 A GB191302022 A GB 191302022A GB 191302022D A GB191302022D A GB 191302022DA GB 191302022 A GB191302022 A GB 191302022A
Authority
GB
United Kingdom
Prior art keywords
circuit
relay
bell
call
systems
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
Inventor
Edward Alfred Graham
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191302022A publication Critical patent/GB191302022A/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

Abstract

2022. Graham, E. A. Jan. 24. Direct-call systems.-In systems of the kind in which a call is made by vibrations set up at the calling station acting on the telephone receiver d at the called station, there is arranged in series or parallel with the receiver a relay c which brings into circuit a call-bell a. The circuit of the bell is broken by the relay e when the transmitter switch f<1> is closed. The relay c may also bring a lamp into circuit, and the bell circuit may pass directly over the switch f<1>. Specification 10,577/10 is referred to.
GB191302022D 1913-01-24 1913-01-24 Improvements in or relating to Telephonic Systems, Expired GB191302022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191302022T 1913-01-24

Publications (1)

Publication Number Publication Date
GB191302022A true GB191302022A (en) 1913-10-16

Family

ID=32577298

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191302022D Expired GB191302022A (en) 1913-01-24 1913-01-24 Improvements in or relating to Telephonic Systems,

Country Status (1)

Country Link
GB (1) GB191302022A (en)

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