FR856415A - Automatic telephone system - Google Patents

Automatic telephone system

Info

Publication number
FR856415A
FR856415A FR856415DA FR856415A FR 856415 A FR856415 A FR 856415A FR 856415D A FR856415D A FR 856415DA FR 856415 A FR856415 A FR 856415A
Authority
FR
France
Prior art keywords
telephone system
automatic telephone
automatic
telephone
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR856415A publication Critical patent/FR856415A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR856415D 1938-06-17 1939-06-16 Automatic telephone system Expired FR856415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US856415XA 1938-06-17 1938-06-17

Publications (1)

Publication Number Publication Date
FR856415A true FR856415A (en) 1940-06-13

Family

ID=22192982

Family Applications (1)

Application Number Title Priority Date Filing Date
FR856415D Expired FR856415A (en) 1938-06-17 1939-06-16 Automatic telephone system

Country Status (1)

Country Link
FR (1) FR856415A (en)

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