FR970345A - Improvements to loudspeaker telephone systems - Google Patents

Improvements to loudspeaker telephone systems

Info

Publication number
FR970345A
FR970345A FR970345DA FR970345A FR 970345 A FR970345 A FR 970345A FR 970345D A FR970345D A FR 970345DA FR 970345 A FR970345 A FR 970345A
Authority
FR
France
Prior art keywords
telephone systems
loudspeaker telephone
loudspeaker
systems
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)
Inventor
Pierre Grellet-Aumont
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 FR970345A publication Critical patent/FR970345A/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)
FR970345D 1948-08-13 1948-08-13 Improvements to loudspeaker telephone systems Expired FR970345A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR970345T 1948-08-13

Publications (1)

Publication Number Publication Date
FR970345A true FR970345A (en) 1951-01-03

Family

ID=9505036

Family Applications (1)

Application Number Title Priority Date Filing Date
FR970345D Expired FR970345A (en) 1948-08-13 1948-08-13 Improvements to loudspeaker telephone systems

Country Status (1)

Country Link
FR (1) FR970345A (en)

Similar Documents

Publication Publication Date Title
FR1006508A (en) Improvements to loudspeaker telephone systems
FR985357A (en) Loud speaker
FR987123A (en) Loudspeaker enhancements
FR1005064A (en) Improvements to single-way loudspeaker telephone installations
FR971797A (en) Improvements to bilateral speakerphone installations
FR970345A (en) Improvements to loudspeaker telephone systems
FR57926E (en) Stylograph refinements
FR60451E (en) Improvements to loudspeaker telephone systems
FR59536E (en) Improvements to electrodynamic loudspeakers
FR995771A (en) Improvements to loudspeaker telephone systems
FR1007879A (en) Improvements to two-wire loudspeaker telephone systems
FR59658E (en) Loudspeaker enhancements
FR924759A (en) Improvements to loudspeaker telephone systems
FR978603A (en) Improvements to telephone systems
FR967338A (en) Improvements to telephone systems
FR978920A (en) Phone enhancements
FR1010952A (en) Improvements to telephone installations
FR58275E (en) Stylograph refinements
FR972678A (en) Improvements to telephone systems
FR1048559A (en) Improvements to loudspeaker telephone systems
FR1037434A (en) Improvements to loudspeaker telephony installations
FR981588A (en) Improvements to drawing devices
FR970126A (en) Improvements to loudspeaker telephony installations
FR966465A (en) Speakerphone enhancements
FR59705E (en) Improvements to telephone systems