FR420901A - Warning device with speakerphone - Google Patents

Warning device with speakerphone

Info

Publication number
FR420901A
FR420901A FR420901DA FR420901A FR 420901 A FR420901 A FR 420901A FR 420901D A FR420901D A FR 420901DA FR 420901 A FR420901 A FR 420901A
Authority
FR
France
Prior art keywords
speakerphone
warning device
warning
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
Georges Elie
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.)
GEORGES ELIE
Original Assignee
GEORGES ELIE
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 GEORGES ELIE filed Critical GEORGES ELIE
Application granted granted Critical
Publication of FR420901A publication Critical patent/FR420901A/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
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR420901D 1910-09-29 1910-09-29 Warning device with speakerphone Expired FR420901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR420901T 1910-09-29

Publications (1)

Publication Number Publication Date
FR420901A true FR420901A (en) 1911-02-10

Family

ID=1463993

Family Applications (1)

Application Number Title Priority Date Filing Date
FR420901D Expired FR420901A (en) 1910-09-29 1910-09-29 Warning device with speakerphone

Country Status (1)

Country Link
FR (1) FR420901A (en)

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