FR784729A - Telephone system for fired mines - Google Patents

Telephone system for fired mines

Info

Publication number
FR784729A
FR784729A FR784729DA FR784729A FR 784729 A FR784729 A FR 784729A FR 784729D A FR784729D A FR 784729DA FR 784729 A FR784729 A FR 784729A
Authority
FR
France
Prior art keywords
mines
fired
telephone system
telephone
fired mines
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
Granat
Raoul Savary
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.)
Compagnie des Forges et Acieries de la Marine et dHomecourt
Original Assignee
Compagnie des Forges et Acieries de la Marine et dHomecourt
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 Compagnie des Forges et Acieries de la Marine et dHomecourt filed Critical Compagnie des Forges et Acieries de la Marine et dHomecourt
Application granted granted Critical
Publication of FR784729A publication Critical patent/FR784729A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR784729D 1934-02-01 1934-02-01 Telephone system for fired mines Expired FR784729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR784729T 1934-02-01

Publications (1)

Publication Number Publication Date
FR784729A true FR784729A (en) 1935-07-23

Family

ID=9217445

Family Applications (1)

Application Number Title Priority Date Filing Date
FR784729D Expired FR784729A (en) 1934-02-01 1934-02-01 Telephone system for fired mines

Country Status (1)

Country Link
FR (1) FR784729A (en)

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