FR490134A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR490134A
FR490134A FR490134A FR490134DA FR490134A FR 490134 A FR490134 A FR 490134A FR 490134 A FR490134 A FR 490134A FR 490134D A FR490134D A FR 490134DA FR 490134 A FR490134 A FR 490134A
Authority
FR
France
Prior art keywords
telephone systems
automatic telephone
automatic
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
FR490134A
Other languages
French (fr)
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 Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR490134A publication Critical patent/FR490134A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
FR490134A 1917-05-23 1918-05-21 Improvements to automatic telephone systems Expired FR490134A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US170337A US1355917A (en) 1917-05-23 1917-05-23 Automatic telephone system

Publications (1)

Publication Number Publication Date
FR490134A true FR490134A (en) 1919-04-03

Family

ID=22619485

Family Applications (1)

Application Number Title Priority Date Filing Date
FR490134A Expired FR490134A (en) 1917-05-23 1918-05-21 Improvements to automatic telephone systems

Country Status (2)

Country Link
US (1) US1355917A (en)
FR (1) FR490134A (en)

Also Published As

Publication number Publication date
US1355917A (en) 1920-10-19

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