FR470382A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR470382A
FR470382A FR470382A FR470382DA FR470382A FR 470382 A FR470382 A FR 470382A FR 470382 A FR470382 A FR 470382A FR 470382D A FR470382D A FR 470382DA FR 470382 A FR470382 A FR 470382A
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
FR470382A
Other languages
French (fr)
Inventor
Edward Alfred Graham
William John Rickets
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 FR470382A publication Critical patent/FR470382A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
FR470382A 1914-03-10 1914-04-01 Improvements to telephone systems Expired FR470382A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191406097T 1914-03-10

Publications (1)

Publication Number Publication Date
FR470382A true FR470382A (en) 1914-09-08

Family

ID=32582666

Family Applications (1)

Application Number Title Priority Date Filing Date
FR470382A Expired FR470382A (en) 1914-03-10 1914-04-01 Improvements to telephone systems

Country Status (2)

Country Link
FR (1) FR470382A (en)
GB (1) GB191406097A (en)

Also Published As

Publication number Publication date
GB191406097A (en) 1914-07-09

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