FR487454A - Telephone duplex - Google Patents

Telephone duplex

Info

Publication number
FR487454A
FR487454A FR487454DA FR487454A FR 487454 A FR487454 A FR 487454A FR 487454D A FR487454D A FR 487454DA FR 487454 A FR487454 A FR 487454A
Authority
FR
France
Prior art keywords
duplex
telephone
telephone duplex
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
Pascual Salmeron Gomez
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR487454A publication Critical patent/FR487454A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/08—Arrangements for interconnection between switching centres for phantom working

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR487454D 1917-03-26 1917-11-07 Telephone duplex Expired FR487454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES487454X 1917-03-26

Publications (1)

Publication Number Publication Date
FR487454A true FR487454A (en) 1918-07-09

Family

ID=1523938

Family Applications (1)

Application Number Title Priority Date Filing Date
FR487454D Expired FR487454A (en) 1917-03-26 1917-11-07 Telephone duplex

Country Status (1)

Country Link
FR (1) FR487454A (en)

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