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FR822485A - Improvements to automatic fire alarms - Google Patents

Improvements to automatic fire alarms

Info

Publication number
FR822485A
FR822485A FR822485DA FR822485A FR 822485 A FR822485 A FR 822485A FR 822485D A FR822485D A FR 822485DA FR 822485 A FR822485 A FR 822485A
Authority
FR
France
Prior art keywords
automatic fire
fire alarms
alarms
automatic
fire
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
Hiram Daniel Scott
Frank Miller Small
Harry L Hait
Ross Taylor
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 FR822485A publication Critical patent/FR822485A/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)
FR822485D 1937-05-31 1937-05-31 Improvements to automatic fire alarms Expired FR822485A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR822485T 1937-05-31

Publications (1)

Publication Number Publication Date
FR822485A true FR822485A (en) 1937-12-30

Family

ID=9280923

Family Applications (1)

Application Number Title Priority Date Filing Date
FR822485D Expired FR822485A (en) 1937-05-31 1937-05-31 Improvements to automatic fire alarms

Country Status (1)

Country Link
FR (1) FR822485A (en)

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