FR505640A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR505640A
FR505640A FR505640DA FR505640A FR 505640 A FR505640 A FR 505640A FR 505640D A FR505640D A FR 505640DA FR 505640 A FR505640 A FR 505640A
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
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 FR505640A publication Critical patent/FR505640A/en
Expired legal-status Critical Current

Links

FR505640D 1918-11-04 1919-11-03 Improvements to automatic telephone systems Expired FR505640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US505640XA 1918-11-04 1918-11-04

Publications (1)

Publication Number Publication Date
FR505640A true FR505640A (en) 1920-08-03

Family

ID=43352161

Family Applications (1)

Application Number Title Priority Date Filing Date
FR505640D Expired FR505640A (en) 1918-11-04 1919-11-03 Improvements to automatic telephone systems

Country Status (1)

Country Link
FR (1) FR505640A (en)

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