GB479881A - Improvements in or relating to electrical communication systems - Google Patents

Improvements in or relating to electrical communication systems

Info

Publication number
GB479881A
GB479881A GB22461/36A GB2246136A GB479881A GB 479881 A GB479881 A GB 479881A GB 22461/36 A GB22461/36 A GB 22461/36A GB 2246136 A GB2246136 A GB 2246136A GB 479881 A GB479881 A GB 479881A
Authority
GB
United Kingdom
Prior art keywords
relay
line
terminal
delay
calling
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
GB22461/36A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB479881A publication Critical patent/GB479881A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
GB22461/36A 1936-08-14 1936-08-14 Improvements in or relating to electrical communication systems Expired GB479881A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB230160X 1936-08-14

Publications (1)

Publication Number Publication Date
GB479881A true GB479881A (en) 1938-02-14

Family

ID=10188719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22461/36A Expired GB479881A (en) 1936-08-14 1936-08-14 Improvements in or relating to electrical communication systems

Country Status (5)

Country Link
BE (1) BE422659A (fr)
CH (1) CH230160A (fr)
FR (1) FR825569A (fr)
GB (1) GB479881A (fr)
NL (1) NL49757C (fr)

Also Published As

Publication number Publication date
BE422659A (fr)
FR825569A (fr) 1938-03-07
NL49757C (fr)
CH230160A (de) 1943-12-15

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