FR439839A - Système de téléphone - Google Patents

Système de téléphone

Info

Publication number
FR439839A
FR439839A FR439839A FR439839DA FR439839A FR 439839 A FR439839 A FR 439839A FR 439839 A FR439839 A FR 439839A FR 439839D A FR439839D A FR 439839DA FR 439839 A FR439839 A FR 439839A
Authority
FR
France
Prior art keywords
phone system
phone
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
FR439839A
Other languages
English (en)
Inventor
Elmer Reed Corwin
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 FR439839A publication Critical patent/FR439839A/fr
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
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR439839A 1912-02-07 1912-02-07 Système de téléphone Expired FR439839A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191203097T 1912-02-07

Publications (1)

Publication Number Publication Date
FR439839A true FR439839A (fr) 1912-06-24

Family

ID=34358109

Family Applications (1)

Application Number Title Priority Date Filing Date
FR439839A Expired FR439839A (fr) 1912-02-07 1912-02-07 Système de téléphone

Country Status (3)

Country Link
DE (1) DE260189C (fr)
FR (1) FR439839A (fr)
GB (1) GB191203097A (fr)

Also Published As

Publication number Publication date
GB191203097A (en) 1912-09-19
DE260189C (fr)

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