GB712176A - Improvements in or relating to communication systems - Google Patents

Improvements in or relating to communication systems

Info

Publication number
GB712176A
GB712176A GB6928/50A GB692850A GB712176A GB 712176 A GB712176 A GB 712176A GB 6928/50 A GB6928/50 A GB 6928/50A GB 692850 A GB692850 A GB 692850A GB 712176 A GB712176 A GB 712176A
Authority
GB
United Kingdom
Prior art keywords
relay
call
lamp
plug
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
GB6928/50A
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 GB712176A publication Critical patent/GB712176A/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)
GB6928/50A 1949-03-19 1950-03-20 Improvements in or relating to communication systems Expired GB712176A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB712176A true GB712176A (en) 1954-07-21

Family

ID=20315759

Family Applications (2)

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
GB28998/52A Expired GB712227A (en) 1949-03-19 1950-03-20 Improvements in or relating to telecommunication systems

Family Applications After (1)

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

Country Status (4)

Country Link
BE (1) BE494602A (enrdf_load_stackoverflow)
DE (1) DE874465C (enrdf_load_stackoverflow)
FR (1) FR1018794A (enrdf_load_stackoverflow)
GB (2) GB712176A (enrdf_load_stackoverflow)

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
FR1018794A (fr) 1953-01-13
BE494602A (enrdf_load_stackoverflow)
GB712227A (en) 1954-07-21

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