FR722639A - Alarm signaling signal for telephone circuits - Google Patents

Alarm signaling signal for telephone circuits

Info

Publication number
FR722639A
FR722639A FR722639DA FR722639A FR 722639 A FR722639 A FR 722639A FR 722639D A FR722639D A FR 722639DA FR 722639 A FR722639 A FR 722639A
Authority
FR
France
Prior art keywords
signaling signal
alarm signaling
telephone circuits
telephone
alarm
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
Other languages
French (fr)
Inventor
Ludwig Huemer
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 filed Critical
Application granted granted Critical
Publication of FR722639A publication Critical patent/FR722639A/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)
FR722639D 1930-08-30 1931-08-28 Alarm signaling signal for telephone circuits Expired FR722639A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1930H0040230 DE567446C (en) 1930-08-30 1930-08-30 Alarm device for the automatic transmission of an alarm call over the subscriber line of a self-access telephone network
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
FR722639A true FR722639A (en) 1932-03-26

Family

ID=10233294

Family Applications (1)

Application Number Title Priority Date Filing Date
FR722639D Expired FR722639A (en) 1930-08-30 1931-08-28 Alarm signaling signal for telephone circuits

Country Status (5)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE896065C (en) * 1950-06-07 1953-11-09 Samuel Dunseith Mckellen Alarm device with dials for automatic telecommunication connection
DE1035700B (en) * 1955-09-23 1958-08-07 Siemens Ag Circuit arrangement for the delivery of messages via telephone lines

Also Published As

Publication number Publication date
DE567446C (en) 1933-01-03
BE382314A (en) 1931-09-30
CH162598A (en) 1933-06-30
GB377489A (en) 1932-07-28

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