FR476397A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR476397A
FR476397A FR476397A FR476397DA FR476397A FR 476397 A FR476397 A FR 476397A FR 476397 A FR476397 A FR 476397A FR 476397D A FR476397D A FR 476397DA FR 476397 A FR476397 A FR 476397A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
FR476397A
Other languages
French (fr)
Inventor
Edward Alfred Graham
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 FR476397A publication Critical patent/FR476397A/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)
  • Devices For Supply Of Signal Current (AREA)
FR476397A 1914-03-23 1914-10-26 Improvements to telephone systems Expired FR476397A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191407331T 1914-03-23

Publications (1)

Publication Number Publication Date
FR476397A true FR476397A (en) 1915-07-29

Family

ID=32647755

Family Applications (1)

Application Number Title Priority Date Filing Date
FR476397A Expired FR476397A (en) 1914-03-23 1914-10-26 Improvements to telephone systems

Country Status (2)

Country Link
FR (1) FR476397A (en)
GB (1) GB191407331A (en)

Also Published As

Publication number Publication date
GB191407331A (en) 1914-11-05

Similar Documents

Publication Publication Date Title
FR475417A (en) Improvements to telephone systems
FR500065A (en) Improvements to automatic telephone systems
FR476397A (en) Improvements to telephone systems
FR470382A (en) Improvements to telephone systems
FR479700A (en) Improvements to telephone systems
FR462486A (en) Improvements to telephone systems
FR473194A (en) Improvements to Commercial Telephone Systems
FR487308A (en) Improvements to automatic telephone systems
FR482854A (en) Development of telephone systems
FR478602A (en) Arcons refinements
FR24391E (en) Improvements to radio signaling systems
FR499529A (en) Improvements to metered telephone systems
FR490888A (en) Improvements to metered telephone systems
FR487177A (en) Improvements to semi-automatic telephone systems
FR506270A (en) Improvements to semi-automatic telephone systems
FR516354A (en) Improvements to telephone exchange systems
FR520586A (en) Improvements to distribution systems
FR487962A (en) Improvements to automatic telephone systems
FR499058A (en) Improvements to telegraph systems
FR470413A (en) Improvements to mirrors
FR506275A (en) Improvements to telephone network systems
FR492272A (en) Improvements to automatic telephone systems
FR487064A (en) Improvements to automatic telephone systems
FR525385A (en) Improvements to radio signaling systems
FR535489A (en) Improvements to radio signaling systems