GB377489A - Improvements in alarm devices for use in connection with telephone systems - Google Patents

Improvements in alarm devices for use in connection with telephone systems

Info

Publication number
GB377489A
GB377489A GB25787/31A GB2578731A GB377489A GB 377489 A GB377489 A GB 377489A GB 25787/31 A GB25787/31 A GB 25787/31A GB 2578731 A GB2578731 A GB 2578731A GB 377489 A GB377489 A GB 377489A
Authority
GB
United Kingdom
Prior art keywords
shaft
disc
alarm
magnet
lifted
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
GB25787/31A
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
Priority to DE1930H0040230 priority Critical patent/DE567446C/de
Priority to FR722639D priority patent/FR722639A/fr
Priority to BE382314D priority patent/BE382314A/xx
Priority to CH162598D priority patent/CH162598A/de
Application filed by Individual filed Critical Individual
Priority to GB25787/31A priority patent/GB377489A/en
Publication of GB377489A publication Critical patent/GB377489A/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
    • H04M11/045—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
GB25787/31A 1930-08-30 1931-09-14 Improvements in alarm devices for use in connection with telephone systems Expired GB377489A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE1930H0040230 DE567446C (de) 1930-08-30 1930-08-30 Alarmvorrichtung zur automatischen UEbermittlung eines Alarmrufes ueber die Teilnehmerleitung eines Selbstanschlussfernsprechnetzes
FR722639D FR722639A (fr) 1930-08-30 1931-08-28 Signal avertisseur d'alarme pour circuits téléphoniques
BE382314D BE382314A (enrdf_load_stackoverflow) 1930-08-30 1931-08-28
CH162598D CH162598A (de) 1930-08-30 1931-08-28 Alarmvorrichtung.
GB25787/31A GB377489A (en) 1930-08-30 1931-09-14 Improvements in alarm devices for use in connection with telephone systems

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1930H0040230 DE567446C (de) 1930-08-30 1930-08-30 Alarmvorrichtung zur automatischen UEbermittlung eines Alarmrufes ueber die Teilnehmerleitung eines Selbstanschlussfernsprechnetzes
CH162598T 1931-08-28
GB25787/31A GB377489A (en) 1930-08-30 1931-09-14 Improvements in alarm devices for use in connection with telephone systems

Publications (1)

Publication Number Publication Date
GB377489A true GB377489A (en) 1932-07-28

Family

ID=10233294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25787/31A Expired GB377489A (en) 1930-08-30 1931-09-14 Improvements in alarm devices for use in connection with telephone systems

Country Status (5)

Country Link
BE (1) BE382314A (enrdf_load_stackoverflow)
CH (1) CH162598A (enrdf_load_stackoverflow)
DE (1) DE567446C (enrdf_load_stackoverflow)
FR (1) FR722639A (enrdf_load_stackoverflow)
GB (1) GB377489A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE896065C (de) * 1950-06-07 1953-11-09 Samuel Dunseith Mckellen Alarmvorrichtung mit Waehlern zum selbsttaetigen Fernmeldeanschluss
DE1035700B (de) * 1955-09-23 1958-08-07 Siemens Ag Schaltungsanordnung zur Abgabe von Meldungen ueber Fernsprechleitungen

Also Published As

Publication number Publication date
CH162598A (de) 1933-06-30
DE567446C (de) 1933-01-03
FR722639A (fr) 1932-03-26
BE382314A (enrdf_load_stackoverflow) 1931-09-30

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