FR712321A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR712321A
FR712321A FR712321DA FR712321A FR 712321 A FR712321 A FR 712321A FR 712321D A FR712321D A FR 712321DA FR 712321 A FR712321 A FR 712321A
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
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR712321A publication Critical patent/FR712321A/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)
FR712321D 1930-06-11 1930-06-11 Improvements to telephone systems Expired FR712321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR712321T 1930-06-11

Publications (1)

Publication Number Publication Date
FR712321A true FR712321A (en) 1931-09-30

Family

ID=9079312

Family Applications (1)

Application Number Title Priority Date Filing Date
FR712321D Expired FR712321A (en) 1930-06-11 1930-06-11 Improvements to telephone systems

Country Status (1)

Country Link
FR (1) FR712321A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918094C (en) * 1938-11-26 1954-09-20 Telefonbau & Normalzeit Gmbh Circuit arrangement for telephone systems with dialer operation and several exchanges which are connected to one another by inductively sealed lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918094C (en) * 1938-11-26 1954-09-20 Telefonbau & Normalzeit Gmbh Circuit arrangement for telephone systems with dialer operation and several exchanges which are connected to one another by inductively sealed lines

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