FR809207A - Improvements made to automatic emergency call transmitters by a subscriber line to an automatic telephone exchange - Google Patents

Improvements made to automatic emergency call transmitters by a subscriber line to an automatic telephone exchange

Info

Publication number
FR809207A
FR809207A FR809207DA FR809207A FR 809207 A FR809207 A FR 809207A FR 809207D A FR809207D A FR 809207DA FR 809207 A FR809207 A FR 809207A
Authority
FR
France
Prior art keywords
automatic
subscriber line
emergency call
improvements made
telephone exchange
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)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR809207A publication Critical patent/FR809207A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc
    • 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)
FR809207D 1935-08-08 1936-07-22 Improvements made to automatic emergency call transmitters by a subscriber line to an automatic telephone exchange Expired FR809207A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE463771X 1935-08-08

Publications (1)

Publication Number Publication Date
FR809207A true FR809207A (en) 1937-02-26

Family

ID=20310239

Family Applications (1)

Application Number Title Priority Date Filing Date
FR809207D Expired FR809207A (en) 1935-08-08 1936-07-22 Improvements made to automatic emergency call transmitters by a subscriber line to an automatic telephone exchange

Country Status (2)

Country Link
FR (1) FR809207A (en)
GB (1) GB463771A (en)

Also Published As

Publication number Publication date
GB463771A (en) 1937-04-06

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