GB712227A - Improvements in or relating to telecommunication systems - Google Patents

Improvements in or relating to telecommunication systems

Info

Publication number
GB712227A
GB712227A GB28998/52A GB2899852A GB712227A GB 712227 A GB712227 A GB 712227A GB 28998/52 A GB28998/52 A GB 28998/52A GB 2899852 A GB2899852 A GB 2899852A GB 712227 A GB712227 A GB 712227A
Authority
GB
United Kingdom
Prior art keywords
exchange
relating
march
telecommunication systems
claesson
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
GB28998/52A
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.)
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
Publication of GB712227A publication Critical patent/GB712227A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
GB28998/52A 1949-03-19 1950-03-20 Improvements in or relating to telecommunication systems Expired GB712227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE712176X 1949-03-19

Publications (1)

Publication Number Publication Date
GB712227A true GB712227A (en) 1954-07-21

Family

ID=20315759

Family Applications (2)

Application Number Title Priority Date Filing Date
GB28998/52A Expired GB712227A (en) 1949-03-19 1950-03-20 Improvements in or relating to telecommunication systems
GB6928/50A Expired GB712176A (en) 1949-03-19 1950-03-20 Improvements in or relating to communication systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB6928/50A Expired GB712176A (en) 1949-03-19 1950-03-20 Improvements in or relating to communication systems

Country Status (4)

Country Link
BE (1) BE494602A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE874465C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1018794A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (2) GB712227A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018932B (de) * 1955-08-11 1957-11-07 Siemens Ag Alarmrufeinrichtung bei Wechselsprechanlagen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE730913C (de) * 1941-04-30 1943-01-28 Siemens Ag Meldeanlage fuer die UEbermittlung von Meldungen verschiedener Bedeutung und fuer die Herstellung von Fernsprechverbindungen ueber Schleifenleitungen

Also Published As

Publication number Publication date
DE874465C (de) 1953-04-23
BE494602A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR1018794A (fr) 1953-01-13
GB712176A (en) 1954-07-21

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